The best home fermentation supplies (2026)

Fermentation is one of the cheapest kitchen hobbies to start: the bacteria do the work for free. The gear exists to solve exactly two problems — keep your vegetables under the brine (where there's no oxygen for mold) and let CO₂ escape without letting air in. Almost every product below is just a different answer to those two problems. So rather than rank a single "best kit," this guide is organized by the job each piece does, with a beginner pick and an upgrade for each.

Some links below are affiliate links — if you buy through them, Moon Dog may earn a small commission at no extra cost to you. We only point to gear we'd actually use.

Quick picks by job

The vessel: jars vs. crocks

For most people getting started, wide-mouth mason jars are the right answer. The wide mouth matters: it's what lets a tamper, a weight, and your hand actually fit inside. A quart jar is perfect for a single small ferment; half-gallon jars are the sweet spot for a head of cabbage's worth of kraut. They're cheap, glass (so they won't stain or hold odors), and every fermentation lid and weight on the market is built to fit a standard wide-mouth opening.

If you ferment in volume — gallons of kraut or pickles at a time — a water-seal stoneware fermentation crock is the upgrade. The genius of the design is the water-filled moat in the rim: it forms a one-way gas seal that lets CO₂ bubble out while keeping air (and mold spores) out entirely, with no parts to fuss over. Most water-seal crocks come with heavy stoneware weight stones sized to the crock. They're an investment, but a good one lasts a lifetime.

Keep it airless: lids and airlocks

The classic method is a plain lid you "burp" daily to release pressure — it works, but it's easy to forget, and a forgotten jar can pop. The fix is an airlock. The most popular beginner option is a set of silicone "pickle pipe" airlock lids, which auto-vent CO₂ through a one-way valve so you never burp a jar again. If you prefer the traditional bubbler look, water-channel airlock lids do the same job with a visible bubble you can watch. Either beats burping.

Keep it submerged: weights and tampers

This is the step beginners skip and then regret. Vegetables float; anything above the brine line is exposed to air and grows mold. Glass fermentation weights sized for wide-mouth jars sit on top of the vegetables and hold them under — glass because it's inert, won't react with the acidic brine, and is dishwasher-safe. To pack a jar tightly and drive out air pockets, an acacia or wooden tamper is a genuine quality-of-life upgrade. If you'd rather buy it all at once, an all-in-one mason-jar fermentation kit typically bundles the airlock lids, glass weights, and a tamper for less than buying them separately.

The active ingredient: salt (and what not to use)

Salt is the one consumable that actually matters, and the rule is simple: use salt with no iodine and no anti-caking agents, because both can inhibit the fermentation or cloud the brine. Fine sea salt and canning/pickling salt are both perfect — pickling salt dissolves fast and has zero additives by design. Avoid standard iodized table salt. Because the target is a percentage by weight (about 2% for sauerkraut), a small digital gram scale is the single most useful tool here — far more reliable than measuring salt by volume, since densities vary by salt type. We cover the exact math in how much salt for sauerkraut.

Optional but nice: pH strips

You don't strictly need to test a vegetable ferment — a properly salted, submerged ferment is self-acidifying and safe — but pH test strips (the 0–6 range) are reassuring confirmation that your kraut or pickles have dropped below pH 4.6 into the safe, acidic zone. They're cheap peace of mind, especially for your first few batches.

Brewing kombucha: the starter kit

Kombucha needs a living culture, so the gear list is different. The simplest start is a kombucha starter kit with a live SCOBY, which includes the culture plus the all-important starter liquid (the acidic kombucha that protects your first brew). You'll also want a 1-gallon glass brewing jar with a breathable cloth cover for the first ferment, and a few swing-top (Grolsch-style) bottles to trap carbonation during the second ferment. The ratios and timing are in our kombucha first and second ferment guide.

Once you've got the gear, here's the method

Equipment is the easy half. The recipes are where batches succeed or fail. Our free guides cover the two ferments most people start with:

• Vegetables: how much salt for sauerkraut — the 2% rule, brine percentages, and a worked example.
• Kombucha: first and second ferment — sweet-tea ratios, SCOBY care, timing, and carbonation.
• Start here if you're new: the Fermentation Guides index.