Oh hey! Sorry for the slow reply, I just noticed the notification . I got mine at a homebrew store, but here they are on Amazon
Water kefir is another good option - one you get the grains rehydrated it makes a new batch every 24 hours or so, and you can referment it with fruit juice to make a fizzy probiotic drink. It’s much easier to get started with than kombucha
I mean, someone definitely is in this scenario, but I don’t think it’s me lol