Skip to content
Scoby & Spout

Scoby & Spout

Where to buy a culture, and how to tell it is healthy

The culture is the one part of a home ferment you cannot improvise. Everything else in the cupboard has a substitute; this does not.

A pale kombucha pellicle floating at the surface of a glass fermentation jar
Score8.5no photo yet

Our top pick in cultures & scobys

Fermentaholics Organic Kombucha SCOBY with 12 fl oz Starter Tea

A hand-selected pellicle with twelve fluid ounces of mature starter tea, measured against the maker’s own published ten percent rule for a gallon.

Check price on Amazon

#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.

The short answer

Buy a culture from a supplier who publishes how much starter tea comes with it, and match that volume to your batch: roughly ten percent of the batch size. A pellicle arriving in a splash of liquid is a much weaker start than a pellicle arriving in a measured cup of mature, acidic starter tea.

What a SCOBY actually is

SCOBY stands for symbiotic culture of bacteria and yeast. In everyday use people point at the rubbery disc floating on top and call that the SCOBY, and that is a slight misnomer worth clearing up because it changes what you buy. The disc — properly, the pellicle — is a cellulose mat the bacteria build. The actual community of yeast and acetic acid bacteria is suspended throughout the liquid.

This is why the starter tea matters more than the pellicle. It carries the organisms, and it carries the acidity that protects a fresh sweet batch during the first days, before the new culture has produced enough acid of its own to defend itself. The full SCOBY guide covers growing one from a bottle of shop kombucha, how long that takes, and what a healthy one looks like.

How much starter tea you need

Ten percent of the batch volume is the working rule, and Fermentaholics publishes it in those words. The arithmetic is simple and worth doing before you order:

Starter tea at the published 10 percent rule.
BatchVolumeStarter tea at 10%Common product size
Half gallon64 oz6.4 oz0.75 cups (6 fl oz)
1 gallon128 oz12.8 oz12 fl oz
2 gallons256 oz25.6 ozTwo 12 fl oz packs

Buying a half-gallon culture for a gallon batch is the commonest ordering mistake. It works, but the batch spends longer in the vulnerable window, which is precisely when mold gets a foothold.

Four drink ferments, four different organisms

Kombucha is one of several drink ferments that look similar in a jar and behave nothing alike. They are not interchangeable, and you cannot convert one into another by changing what you feed it.

  • Kombucha. Black or green tea plus cane sugar. Seven to fourteen days. Sour, tea-forward.
  • Jun. Green tea plus honey, a genuinely different culture, and it runs cooler and faster. Jun vs kombucha compares them properly.
  • Water kefir. Sugar water plus grains, no tea, no caffeine, and a 24-to-48-hour cycle rather than a fortnight. Kombucha vs water kefir.
  • Ginger bug. Not a purchased culture at all — you build one from fresh ginger, sugar and water in about a week. How to make a ginger bug.

Buying a live culture, and what can go wrong

A live culture is a live thing in a box, and that is the honest risk. It travels through unheated and overheated spaces, it can sit in a depot over a weekend, and none of that is under the seller's control once it ships. The things that are under their control, and that you can check before ordering:

  • The volume of starter tea, stated in fluid ounces or cups rather than described as 'plenty'.
  • What the starter tea is made of. Fermentaholics publishes its ingredients — organic cane sugar, filtered water, organic black tea, live cultures — which is rare and lets you check there is nothing in it you did not want.
  • How long the culture was grown before shipping. The Kombucha Shop states a minimum of six weeks.
  • Certification, where it matters to you. USDA Organic, Kosher and Non-GMO are all stated by the sellers on this site.

Heads up: some links on this page are affiliate links. If you buy through one we may earn a commission at no extra cost to you. It never changes a ranking, and we take no payment for placement. The full version.

The short answer

Quick picks

Ranked on the published rubric. Every row jumps to that product's full write-up below; the button goes straight to Amazon.

#ProductBest forScorePrice
1
Score8.5

Fermentaholics

Organic Kombucha SCOBY with 12 fl oz Starter Tea

A hand-selected pellicle with twelve fluid ounces of mature starter tea, measured against the maker’s own published ten percent rule for a gallon.

A one-gallon first batch8.5out of 10
2
Score8.9

Cultures for Health

Water Kefir Grains (Dehydrated)

Two teaspoons of dehydrated grains that rehydrate to three or four tablespoons and then turn out two to three quarts every 24 to 48 hours, indefinitely.

A ferment that finishes in 48 hours8.9out of 10
3
Score8.1

Fermentaholics

Organic Live Kombucha SCOBY, Half-Gallon Batch

The same organic culture line dosed for half a gallon — three quarters of a cup of starter tea with a pellicle, which is the right amount for a smaller jar.

A half-gallon trial batch8.1out of 10
4
Score7.9

Fermentaholics

Organic Dehydrated Water Kefir Grains

The same dehydrated-grain format with USDA Organic certification and the maker’s own published rehydration method.

Certified organic water kefir7.9out of 10
Score8.5no photo yet

#1 · A one-gallon first batch

Fermentaholics Organic Kombucha SCOBY with 12 fl oz Starter Tea

A hand-selected pellicle with twelve fluid ounces of mature starter tea, measured against the maker’s own published ten percent rule for a gallon.

Who it is for. Anyone starting a standard one-gallon batch who wants the starter tea measured for them.

Published specifications

Batch size
One gallon
Starter tea volume
12 fl oz of mature, active starter tea
Pellicle
Hand-selected
Starter tea ingredients
Organic cane sugar, filtered water, organic black tea, live cultures
Certification
USDA Certified Organic, Kosher, Non-GMO, vegan
Production
Grown in the maker’s licensed lab
Maker’s dosing rule
“the rule of thumb is to use 10% starter tea per batch size”

Source: Fermentaholics published SCOBY specification (12 fl oz starter tea, 1-gallon dosing, ingredients, certifications) and its published 10 percent starter rule, retrieved 2026-09-01

Rubric — 8.5 / 10

  • Materials9/10 · weight 28%
  • Documentation9/10 · weight 22%
  • Capacity fit8/10 · weight 16%
  • Cleaning8/10 · weight 18%
  • Value8/10 · weight 16%

What it gets right

  • 12 fl oz against a 128 oz gallon is 9.4 percent, within a rounding error of the maker’s own 10 percent rule — the quantity matches the instruction
  • Starter tea is the part that actually acidifies a new batch and protects it from mold; the pellicle is mostly a raft
  • Ingredients of the starter tea are published, which almost no culture seller does
  • Certified organic, kosher, non-GMO and vegan are stated together

What it costs you

  • A live culture in transit is a live culture in transit — heat and delay are real risks nobody controls
  • No stated shelf life once it arrives
  • You still need tea, sugar and a jar

Skip it if. You are brewing half a gallon. Buy the half-gallon version instead; a gallon’s worth of starter in a half-gallon batch drives the acidity too far, too fast.

Check price on Amazon

#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.

Score8.9no photo yet

#2 · A ferment that finishes in 48 hours

Cultures for Health Water Kefir Grains (Dehydrated)

Two teaspoons of dehydrated grains that rehydrate to three or four tablespoons and then turn out two to three quarts every 24 to 48 hours, indefinitely.

Who it is for. Someone who wants a fizzy home ferment on a two-day cycle, with no tea and no caffeine.

Published specifications

Shipped form
Dehydrated. Each packet contains 2 teaspoons of live active grains
Rehydration time
3-4 days; may take up to 7 days
Rehydration water
Unchlorinated, unfluoridated water with cane sugar
Activation sugar
1/4 cup cane sugar to 3-4 cups water
Rehydrated volume
3-4 tablespoons of grains
Output
2-3 quarts every 24-48 hours once established
Working ratio
1-2 teaspoons of grains per 4 cups of liquid
Culture temperature
68-85 F
Shelf life, room temperature
12-18 months at 68-78 F
Shelf life, refrigerated
18+ months at 40-45 F

Source: Cultures for Health published water kefir grain specifications (packet volume, rehydration, ratios, storage temperatures and shelf life), culturesforhealth.com water kefir FAQ and starter culture instructions, retrieved 2026-09-01

Rubric — 8.9 / 10

  • Materials9/10 · weight 28%
  • Documentation10/10 · weight 22%
  • Capacity fit8/10 · weight 16%
  • Cleaning8/10 · weight 18%
  • Value9/10 · weight 16%

What it gets right

  • A 24-to-48-hour cycle against kombucha’s 7 to 14 days — this is the ferment for someone impatient
  • Dehydrated grains have a published 12-to-18-month room-temperature shelf life, so the packet can sit in a drawer until you are ready
  • Every number a beginner needs is published: activation ratio, working ratio, temperature band, output volume
  • No tea and no caffeine, so it suits households that will not drink kombucha

What it costs you

  • Three to seven days of rehydration before the first real batch, which is longer than a kombucha SCOBY takes to get going
  • Chlorinated tap water will stall or kill the grains, so filtered water is not optional
  • Grains multiply, and you will be giving them away or throwing them out within a month

Skip it if. You want the sour, tea-driven flavor of kombucha. Water kefir is lighter, sweeter and closer to a soda; it is a different drink, not a faster kombucha.

Check price on Amazon

#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.

Score8.1no photo yet

#3 · A half-gallon trial batch

Fermentaholics Organic Live Kombucha SCOBY, Half-Gallon Batch

The same organic culture line dosed for half a gallon — three quarters of a cup of starter tea with a pellicle, which is the right amount for a smaller jar.

Who it is for. A cautious first-timer, or anyone testing whether they will actually drink the stuff before committing a gallon of tea.

Published specifications

Batch size
Half gallon
Starter tea volume
0.75 cups (6 fl oz) of strong, mature liquid starter tea
Pellicle
Starter pellicle included
Certification
USDA Certified Organic
Maker’s dosing rule
10 percent starter tea per batch size

Source: Fermentaholics published half-gallon SCOBY specification (0.75 cups starter tea, starter pellicle, USDA Organic), retrieved 2026-09-01

Rubric — 8.1 / 10

  • Materials9/10 · weight 28%
  • Documentation8/10 · weight 22%
  • Capacity fit7/10 · weight 16%
  • Cleaning8/10 · weight 18%
  • Value8/10 · weight 16%

What it gets right

  • 6 fl oz into 64 oz is 9.4 percent — the same ratio as the gallon version, correctly scaled rather than just halved on the label
  • A half gallon is a cheaper mistake to make while you learn what your kitchen’s temperature does to a ferment
  • Same certified organic culture line as the gallon product
  • Fits a half-gallon mason jar, which many people already own

What it costs you

  • A smaller volume of liquid changes temperature faster, so a half gallon is more sensitive to a cold night than a full one
  • You will outgrow it, and the culture then has to be built up over a batch or two
  • Less starter tea means less margin if the room is cool

Skip it if. You already know you want a gallon a week. Buying the smaller culture first costs you two batches of build-up.

Check price on Amazon

#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.

Score7.9no photo yet

#4 · Certified organic water kefir

Fermentaholics Organic Dehydrated Water Kefir Grains

The same dehydrated-grain format with USDA Organic certification and the maker’s own published rehydration method.

Who it is for. Someone already buying kombucha cultures from the same maker who wants water kefir certified organic too.

Published specifications

Shipped form
Dehydrated grains
Certification
USDA Certified Organic
Rehydration
Maker publishes a step-by-step rehydration method for dehydrated grains
Feedstock
Cane sugar in unchlorinated water
Grain weight
Not published

Source: Fermentaholics published organic dehydrated water kefir grain listing and rehydration guide, fermentaholics.com/how-to-rehydrate-water-kefir-grains/, retrieved 2026-09-01

Rubric — 7.9 / 10

  • Materials9/10 · weight 28%
  • Documentation7/10 · weight 22%
  • Capacity fit7/10 · weight 16%
  • Cleaning8/10 · weight 18%
  • Value8/10 · weight 16%

What it gets right

  • Certified organic, which matters more here than usual because the grains live in the sugar you feed them
  • The maker publishes its own rehydration walkthrough rather than leaving you to a forum
  • Dehydrated grains ship without the timing pressure of a live culture
  • Same maker as the kombucha cultures, so one order can cover both ferments

What it costs you

  • Grain weight or volume is not published, so you cannot compare the packet size against alternatives
  • Rehydration is still days of feeding before a first real batch
  • No published shelf life

Skip it if. You want the exact packet quantity before you order. It is not published here; the Cultures for Health packet states two teaspoons.

Check price on Amazon

#ad No live price feed yet, so no number is shown rather than a stale one. How this is funded.

FAQ

Questions people actually ask

Where can I buy a kombucha SCOBY?
From a dedicated culture supplier, from a general marketplace listing, or free from another brewer — every healthy batch grows a new pellicle, so brewers usually have spares. Buy from whoever publishes the volume of starter tea included, because that number is what protects your first batch.
How much starter tea do I need for one gallon?
Roughly 10 percent of the batch, which is about 12 to 13 fluid ounces for a one-gallon batch. Fermentaholics publishes the 10 percent rule and ships 12 fl oz with its gallon culture, which is 9.4 percent.
Can I grow my own SCOBY from a bottle of kombucha?
Yes, from a raw, unpasteurized, unflavored bottle plus sweet tea, left covered in a warm spot. It takes a couple of weeks and it depends entirely on the bottle being genuinely live. It is slower and less reliable than buying a culture, but it costs almost nothing.
Is a jun culture just a kombucha SCOBY fed honey?
No. Jun is a distinct culture community adapted to honey and green tea. Feeding a kombucha SCOBY honey tends to weaken it rather than convert it, which is why jun is sold as its own culture.
How long does a kombucha culture last?
Indefinitely with regular feeding. Cultures are reused batch after batch and grow a fresh pellicle every time. Between batches they are kept in a SCOBY hotel — a jar of strong finished kombucha that keeps them fed and acidic.

Sources

Everything in cultures & scobys

The full set

A packaged culture jar sitting on a bright kitchen table

Best culture to buy

Where to buy a SCOBY

Culture houses, marketplaces and other brewers compared — with the single published number that separates a good supplier from a vague one.

Top pick · Fermentaholics Organic Kombucha SCOBY with 12 fl oz Starter Tea

Check price on Amazon
Several jars of fermenting liquid standing on a shelf in daylight

Guide

The SCOBY hotel

Where spare cultures live between batches: the jar, the liquid strength, the feeding interval and the refrigeration question.

Top pick · Fermentaholics One Gallon Plain Glass Kombucha Jars, 2-Pack

Check price on Amazon
A jar of honey beside green tea in bright natural light

Best way to start jun

Jun vs kombucha

Green tea and honey against black tea and sugar, a cooler and faster ferment, and why a kombucha culture cannot be converted to jun.

Top pick · Fermentaholics Essentials Jun Kombucha Brewing Kit

Check price on Amazon
Translucent water kefir grains in a glass jar

Best fast ferment

Kombucha vs water kefir

A fortnight against 48 hours, tea against sugar water, a pellicle against grains — compared on published cycle times and ratios.

Top pick · Cultures for Health Water Kefir Grains (Dehydrated)

Check price on Amazon
Fresh ginger root on a clean white surface

Guide

The ginger bug

How to build a ginger bug from scratch in about a week, how to feed it, and how it differs from a kombucha culture.

Top pick · EZ Cap Swing Top Bottles, Amber Glass, 16 oz (Case of 12)

Check price on Amazon
Pineapple peel in a glass jar of liquid on a bright surface

Guide

Tepache

Pineapple rind, sugar and water in two to four days with no culture to buy — how tepache works and how it compares to kombucha.

Top pick · Fermentaholics Printed Gallon Kombucha Glass Jar

Check price on Amazon