Home-brewed kombucha: a guide to fermenting at home

January 23, 2024

In this era of striving for healthier living, kombucha has emerged as a popular, health-boosting beverage. Originally hailing from East Asia, it is a fermented tea drink that is lauded for its perceived health benefits. The fizzy, sweet-sour drink made from tea, sugar, bacteria, and yeast is loved by many for its unique taste and potential health advantages. If you’re fascinated by this peculiar drink and want to try your hand at making it, this guide is designed for you. We’ll take you through the steps of brewing your kombucha at home, ensuring you have all the information you need to get started.

Gathering Your Ingredients

To brew your kombucha, you’ll need a few basic ingredients and tools:

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  • Tea: black or green tea are the most commonly used, but feel free to experiment with your favorite kind.
  • Sugar: white sugar works best for the initial fermentation process.
  • Water: filtered water is recommended to avoid any impurities that may interfere with the fermentation process.
  • SCOBY: the Symbiotic Culture Of Bacteria and Yeast, or SCOBY, is the living home for the bacteria and yeast that transform sweet tea into tangy, fizzy kombucha.
  • Starter Liquid: some pre-brewed kombucha to kick-start your fermentation process.
  • Brewing Jar: a large glass jar is perfect for brewing—the larger, the better, as kombucha needs room to breathe during fermentation.

Preparing the Tea Base

Start by making a batch of sweet tea. Boil a few cups of water. Add your preferred tea to the boiling water and let it steep for a few minutes, then remove the tea bags or strain the tea leaves. Stir in the sugar while the tea is still hot until it’s fully dissolved.

You might be wondering, why add sugar? It’s crucial to understand that the sugar you add is not for you—it’s for the SCOBY. The SCOBY will feed on the sugar, initiating the fermentation process that eventually results in kombucha.

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Adding the SCOBY and Starter Liquid

Once your sweet tea has cooled to room temperature, transfer it to your brewing jar. It’s now time to add the SCOBY and starter liquid. The starter liquid, typically plain, store-bought kombucha, introduces the necessary bacteria and yeast into your brew.

Make sure your hands are super clean before you handle the SCOBY. Gently place it into the jar of sweet tea. If it sinks, floats, or hangs out in the middle—don’t worry; its position doesn’t impact the brew.

The Fermentation Process

Cover your jar with a cloth or coffee filter and secure it with a rubber band. The kombucha needs to breathe, so don’t use a solid lid. Store it out of direct sunlight at room temperature—the ideal fermenting temperature is between 68-85°F (20-29°C).

The fermentation process generally lasts between 7 and 10 days, depending on your taste preference and the temperature of your home. The longer the kombucha ferments, the less sweet and more vinegar-like it will taste.

It’s a fascinating process to observe. Over the days, your SCOBY will likely form a new layer, a sign that your brew is transforming into kombucha. You might also spot yeast strands, bubbles, or a cloudy mass—these are all normal elements of the fermentation process.

Bottling Your Homebrewed Kombucha

After your kombucha has fermented to your taste preference, it’s time to bottle it. Prepare clean bottles for your brew. Use a plastic or stainless steel strainer to help transfer the kombucha into the bottles, being careful to avoid the SCOBY.

Before you pour all of the kombucha out, remember to reserve enough starter liquid for your next brew. Around one or two cups should be sufficient. This starter liquid will give your next batch of kombucha a head start on the fermentation process.

Enjoying Your Kombucha Brew

Congratulations, your home-brewed kombucha is ready to enjoy! You can drink it right away, or if you prefer a fizzier beverage, you can seal the bottles and let them undergo a second fermentation at room temperature for a few days.

When handling your kombucha, be mindful of the temperature. Kombucha doesn’t like extreme temperatures and is happiest at room temperature. Too cold, and the yeast and bacteria in your brew will go dormant. Too hot, and they might die.

Remember, kombucha brewing can be an art. It can take a few tries to get your perfect brew. But don’t let that discourage you, as the results are well worth the effort. Happy brewing!

Making Your SCOBY Hotel

The crucial role played by the SCOBY in making kombucha cannot be overstated. The Symbiotic Culture Of Bacteria and Yeast (SCOBY) is the engine that drives the fermentation process, converting your sweet tea into a delightful kombucha brew. Therefore, it’s vital to give your SCOBY a comfortable home: a SCOBY hotel.

A SCOBY hotel is a container where you can store your extra SCOBYs and back-up starter liquid. The hotel provides a safe environment for the SCOBYs to live when they’re not being used for brewing.

Starting your own SCOBY hotel is a straightforward process. Find a large glass jar—similar to your brewing jar—and fill it with kombucha tea. You can use either home-brewed kombucha or store-bought, as long as it’s unflavored. Then, place your spare SCOBYs into the jar.

Over time, the SCOBYs in your hotel will continue to ferment the sweet tea, creating even more starter liquid for your future kombucha brews. Do remember to feed your SCOBY hotel with fresh sweet tea every few weeks.

As you continue brewing kombucha, you’ll notice your SCOBY growing and creating new layers or "baby" SCOBYs. These can be added to your SCOBY hotel, always ensuring you have a backup ready for your next batch of kombucha. Remember, keep your SCOBY hotel at room temperature and out of direct sunlight, similar to your brewing conditions.

The Second Fermentation: Flavoring Your Kombucha

Once you’ve bottled your homemade kombucha, you may decide to take your brew to the next level. The second fermentation process is an opportunity to customize your kombucha, adding flavors and increasing the carbonation for a fizzier drink.

During the second fermentation, the bottled kombucha continues to ferment in the presence of additional sugars. These sugars can come from fruits, herbs, or additional sweeteners like honey or agave. The kombucha bacteria and yeast feast on these sugars, creating more carbon dioxide, which gives kombucha its signature effervescence.

To start the second fermentation, add your chosen flavors to the bottled kombucha. Herbs, spices, fruit puree, or juice—all of these can be used to experiment with your kombucha’s taste. Seal the bottles and store them at room temperature for a few days, keeping a close eye on the pressure build-up in the bottles.

Remember, the second fermentation is optional and based on personal preference. If you prefer your kombucha less fizzy and more vinegary, you might skip this step. However, if you love the idea of a homemade, customized, fizzy drink, the second fermentation is a wonderful opportunity to get creative.


Brewing homemade kombucha is a rewarding journey, a blend of science and art. From gathering your ingredients to flavoring your brew, every step is an opportunity to customize and create a drink that’s uniquely yours.

Maintaining a healthy SCOBY hotel ensures you’re always ready to start a new batch of kombucha. Whether you prefer black tea or green, love experimenting with loose leaf teas, or enjoy surprising your palate with an unexpected flavor during the second fermentation—making kombucha at home opens up a world of possibilities.

Remember, the key to a successful kombucha brew is patience and attention to details like room temperature and cleanliness. It might take a few tries to perfect your brew, but with each batch of kombucha, you’re not just crafting a tasty beverage; you’re also potentially boosting your health with every sip.

So, ready your tea bags, prep your SCOBY, and let the brewing adventure begin. Here’s to the joy of brewing kombucha at home!