What equipment do you need to start fermenting at home?

The essentials are wide-mouth glass jars (mason jars work well), a cloth or paper towel cover with a rubber band, plastic or silicone lids for storage, a glass weight to keep vegetables submerged, and a fine-mesh strainer for kefir. You can start for under $20.

Can you use metal containers or utensils for fermentation?

Avoid reactive metals like aluminum and copper, which can leach into acidic ferments. Stainless steel is safe for brief contact and most uses. For daily kefir straining, plastic strainers are preferred. Use plastic or silicone lids instead of metal lids for acidic fermented foods.

Do you need an airlock for fermenting vegetables?

No, an airlock is not required. A cloth-covered jar works fine for most vegetable ferments. Airlock lids are a nice optional upgrade that let CO2 escape without letting air in, which can reduce kahm yeast, but they are not necessary for safe fermentation.

What size jars are best for fermentation?

Use 1 liter (1 quart) jars for kefir and sourdough starter. Use 2 liter jars for vegetable ferments. Wide-mouth jars are easier to fill, clean, and fit weights into. Glass is preferred because it is non-reactive and lets you see the fermentation progress.

Fermentation Jan 18, 2026

Kitchen Staples for Fermentation (Minimal Gear, Maximum Safety)

The Fermentation Starter Kit

You can spend a lot on fancy crocks and airlocks. You don’t need to.

Here’s the minimal, effective setup for home fermentation—covering kefir, vegetables, sourdough, and yogurt.

The Essentials (Non-Negotiable)

1. Glass Jars (Wide-Mouth)

Why glass? Non-reactive, easy to clean, lets you see what’s happening.
Wide-mouth makes it easy to get food in and out.
Good sizes: 1 liter (1 quart) for kefir and sourdough starter. 2 liters for vegetable ferments.

Budget pick: Mason jars. Available everywhere, cheap, durable.

2. Cloth or Paper Towel Cover + Rubber Band

For ferments that need airflow (kefir, sourdough starter):

Use: Breathable cloth (like cheesecloth) or a paper towel secured with a rubber band.
Why: Keeps bugs and dust out while letting CO2 escape.

3. Plastic or Silicone Lids (For Storage)

Once fermentation is complete, you need an airtight seal for refrigerator storage.

Avoid metal lids for acidic foods (vinegar, fermented vegetables)—they can corrode.
Plastic canning lids or silicone stretch lids work well.

4. Glass or Ceramic Weight

For vegetable ferments, you need to keep vegetables submerged under brine.

Glass weights sized for wide-mouth jars are ideal.
DIY alternative: A smaller jar filled with water, placed inside the larger jar.

5. Fine-Mesh Strainer (Plastic or Stainless)

Essential for straining kefir grains.

Plastic is preferred for daily kefir straining (some people worry about metal contact, though brief contact with stainless is fine).
Stainless steel works for most other uses.

Nice to Have (Optional Upgrades)

Fermentation Crocks

Ceramic crocks with water-seal lids are traditional and beautiful. They keep out light and maintain stable temperature. Worth it if you ferment large batches of sauerkraut or kimchi regularly.

Airlock Lids

Plastic lids with built-in airlocks (like for winemaking) fit on mason jars. They let CO2 escape without letting air in. Useful for long vegetable ferments. Not necessary—cloth-covered jars work fine.

Digital Kitchen Scale

Accurate salt measurements improve consistency in vegetable ferments.

Recipes often call for “2% salt by weight.” A scale makes this easy.
Recommendation: Any scale accurate to 1 gram.

pH Strips or Meter

For the truly curious. Fermented vegetables should reach pH 4.6 or below to be shelf-stable. Most people never need to test—rely on taste and smell instead.

What to Avoid

Item	Why to Avoid
Reactive metals (aluminum, copper)	Can leach into acidic ferments.
Cracked or chipped jars	Hard to sanitize; bacteria can hide in cracks.
Wooden spoons	Absorb flavors and bacteria. Use plastic, silicone, or stainless for fermentation.
Colored or decorative jars	Some contain lead in the glaze. Stick to clear food-grade glass.

Starter Kit Summary

Ferment	What You Need
Milk Kefir	1L glass jar, cloth cover, fine-mesh strainer, plastic/silicone lid for storage
Vegetable Ferments	2L wide-mouth jar, glass weight, cloth cover or airlock lid
Sourdough Starter	1L glass jar, cloth cover, rubber band, kitchen scale (helpful)
Yogurt	Glass jar or ceramic bowl, towel for insulating, thermometer (optional)

Where to Buy

Mason jars: Grocery stores, hardware stores, Amazon.
Glass weights: Amazon, fermentation specialty sites.
Silicone lids: Amazon, kitchen stores.
Kefir strainers: Often included with kefir grain purchases.

You can start fermenting for under $20 if you already have jars.

Next Steps

Fermentation Basics — What’s actually happening in the jar.
Fermentation Safety Rules — How to know it’s safe.
Quick Fermented Vegetables — Your first ferment.
Milk Kefir — Start culturing dairy.