Kombucha Bottle Alternatives: What Can You Use for Second Fermentation?

You finished your first fermentation, your kombucha tastes just right, and you are ready to add some flavor and fizz. Then you realize one small problem: you do not have flip-top bottles yet.

Good news—your batch is not ruined, and you do not have to skip second fermentation altogether. You may already have a container at home that can work temporarily. The important part is choosing something clean, undamaged, food-safe, and able to close securely.

For dependable carbonation and repeated use, we still recommend glass flip-top bottles. But if you need another option for the batch sitting in front of you, here is what to consider.

If you’re choosing bottles for regular use—not simply working with what you already have—see our guide to the best bottles for kombucha second fermentation. This article focuses on the alternatives that can work when proper flip-top bottles aren’t available.

Quick answer: What can I use instead of flip-top bottles for kombucha?

The best household alternatives are reused commercial kombucha bottles with intact screw caps, clean plastic soda or seltzer bottles, beer bottles with new caps, and certain growlers designed to hold carbonated drinks. Mason jars can also work when flavor is your main goal, but they are usually less reliable for building strong carbonation.

Whatever you choose, make sure the container:

• Is food-safe and intended for beverages
• Has no chips, cracks, deep scratches, or other damage
• Closes tightly without leaking
• Is appropriate for holding carbonation if you want a fizzy result

If you cannot confirm that a container can safely hold carbonation, use it only for a short, lightly carbonated second fermentation—or add your flavor and refrigerate the kombucha without trying to build much pressure.

1. Reused store-bought kombucha bottles

Empty commercial kombucha bottles are often the best option already sitting in your recycling bin. They were originally used for a carbonated drink, and many have sturdy glass and screw caps that create a reasonably tight seal.

Wash the bottle and cap thoroughly, inspect both for damage, and make sure the cap still threads evenly and closes securely. A worn cap or damaged liner may allow carbonation to escape, so your results may vary from one bottle to another.

These bottles can work well in a pinch, but replacement caps are not always easy to find. If the seal begins to wear out, it is time to retire the bottle.

2. Plastic soda or seltzer bottles

A clean plastic bottle that previously held soda or seltzer can be useful for a temporary second fermentation. Unlike an ordinary disposable water bottle, it was designed to hold a carbonated beverage.

Plastic also makes it easy to feel pressure building. The bottle will become firmer as carbonation develops, which can give a new brewer a helpful clue that it is time to refrigerate the kombucha.

We would not choose single-use plastic as a permanent brewing setup. Plastic can scratch, hold odors, and become harder to clean thoroughly over time. Use a clean, undamaged bottle for a batch if needed, then recycle it rather than reusing it indefinitely.

3. Beer bottles with new caps

Beer bottles are made to hold carbonation, but they require the right closure. A standard beer bottle generally needs a new crown cap and a bottle capper to create a proper seal.

Do not assume that the original cap can simply be pressed back onto the bottle. Avoid damaged bottles and twist-off bottles unless you have a closure specifically designed for them.

This option can work well if you already own beer-bottling equipment. If you do not, buying caps and a capper is probably less convenient than investing in reusable flip-top bottles.

4. Growlers

Some growlers can work for kombucha second fermentation, but not every growler is intended for pressure-building fermentation. Many are designed to transport beer that is already carbonated rather than to contain an actively fermenting drink.

Check the growler manufacturer’s guidance before using it. The container and closure should both be suitable for carbonated beverages and free from chips, cracks, or damage. Because a growler holds a larger volume, opening it also exposes the whole batch at once; smaller bottles are usually more convenient for drinking kombucha over several days.

5. Mason jars

Mason jars are convenient for adding fruit, herbs, and other bulky flavoring ingredients. Their wide openings also make them easy to fill and clean.

However, they are not our first choice when strong carbonation is the goal. The lid may not seal as consistently as a flip-top bottle, and standard canning jars are not specifically designed for pressure-building fermentation. They are better suited to a lightly carbonated or flavor-focused second fermentation.

If you use one, choose an undamaged jar with an intact lid, monitor it closely, and refrigerate the kombucha once the flavor has developed.

Bottles and containers we would avoid

Some containers are not worth the uncertainty. We would avoid:

• Ordinary disposable water bottles, which are not designed to hold carbonation
• Standard wine bottles with regular corks or stoppers
• Decorative glass bottles with unknown strength
• Bottles with chipped rims, cracks, deep scratches, or damaged closures
• Any container that leaks or cannot form a secure seal

Sparkling-wine bottles are built differently from ordinary wine bottles, but they still require an appropriate closure. Unless you already have the correct bottling equipment, another option will be much simpler.

The best long-term bottles for second fermentation

Household alternatives can save the day, but reusable glass flip-top bottles are still the easiest long-term option for most home kombucha brewers. Their attached closures are easy to seal and reopen, and a good gasket helps keep the carbonation produced during second fermentation inside the bottle.

We prefer 16-ounce bottles because they are easy to flavor individually, convenient to serve, and simple to refrigerate as each bottle becomes ready. After reserving starter tea for the next batch, a gallon of kombucha generally fills about six 16-ounce bottles.

Our six-pack of clear flip-top kombucha bottles is a practical match for a one-gallon brew. If you prefer added light protection, we also carry six-packs of amber flip-top bottles. Brewers making two gallons at a time—or anyone who wants one set ready while another is being washed—may prefer our 12-pack bottle options.

A few precautions before you seal any bottle

Second fermentation creates carbon dioxide, and a sealed container traps that gas. The amount of pressure can vary with temperature, fermentation time, the amount and type of flavoring, and the activity of your kombucha.

Whichever container you use:

• Clean it thoroughly before filling
• Inspect it every time you use it
• Leave the amount of headspace called for in your brewing instructions
• Monitor the bottles regularly during second fermentation
• Refrigerate them once they have reached the flavor and carbonation you want
• Open chilled bottles slowly and carefully

If you are still struggling to build fizz, our kombucha carbonation guide walks through the other factors that may be getting in the way.

What is second fermentation?

Second fermentation is the optional bottled stage that follows primary fermentation. This is when you can add fruit, juice, herbs, spices, or other flavoring ingredients. Sealing the flavored kombucha in an appropriate container also traps the carbon dioxide produced during fermentation, creating carbonation.

If this is your first batch, start with our complete guide to making kombucha at home. You can also explore our guide to flavoring kombucha during second fermentation when you are ready to choose your ingredients.

Ready for second fermentation

Not having flip-top bottles does not mean you have to abandon this batch. A clean commercial kombucha bottle or plastic soda bottle can help you get through a second fermentation while you decide what setup works best for you.

Just remember that a container should not be trusted simply because the lid fits. Check its condition, make sure it is appropriate for carbonation, and monitor your brew carefully. When you are ready for a reliable setup you can use batch after batch, glass flip-top bottles make the process much easier.

Frequently asked questions

Can I reuse store-bought kombucha bottles?

Yes, many store-bought kombucha bottles can be reused for second fermentation as long as the bottle is undamaged and the original screw cap still seals securely. Inspect the bottle and cap before every use.

Can I use plastic bottles for kombucha second fermentation?

A clean plastic soda or seltzer bottle can work as a temporary option because it was designed to contain carbonation. We do not recommend repeatedly reusing single-use plastic bottles as a permanent brewing setup.

Can I use mason jars for second fermentation?

Mason jars can work for adding flavor, particularly when you are using fruit or other bulky ingredients. They are less reliable for strong carbonation because their lids may not create the same consistent seal as flip-top bottles, and the jars are not specifically designed for pressure-building fermentation.

Can I use wine bottles for kombucha?

Standard wine bottles with regular corks or stoppers are not a good choice for carbonating kombucha. They are not designed to contain the same pressure as bottles made for carbonated beverages, and the closure may not provide a reliable seal.

How many 16-ounce bottles do I need for one gallon of kombucha?

Six 16-ounce bottles are usually a practical match for a one-gallon batch after you reserve starter tea for your next brew. Your exact yield will depend on how much starter tea you save and how full you make each bottle.