You can spend a lot of money on specialized crocks. You’ll learn all about your $25.00-$200.00 is buying you an ideal anaerobic environment in which to nurture your precious bacteria… and so on. So here’s how to turn any mason jar into a Pickl-It Style fermentation crock for about $10.00 or less. To DYI a very serviceable lacto-fermentation crock, you’ll need:
1 airlock. Around $2.00 or less at your local homebrew store. I paid $1.00
1 rubber bung #6 $1.00 or less at your local homebrew store. I paid .77 cents
1 Re-Cap Mason Jar lid online for $6.99 in an appropriate size to hold your ferment. They sell wide mouth and regular re-caps that work for any size mason jars.
Go shopping at your local homebrew store or buy online from a brewery if you don’t have a homebrew store. Buy a 3 piece plastic airlock and a #6 drilled rubber bung. Should cost around three dollars or less total.Put your airlock, bung and Recap Lid together in this order.
Now any mason jar is a fermentation crock. And now you have sealed off your ferment from nasty aerobic critters.