You can make kvass using sauerkraut juice as basis and beets for
flavoring. It's marketed as probiotic drink, so I dunno.
## Sourdough bread
It would be neat to no longer need to buy bread (instead you buy
equivalent amounts of flour). Seems to be easy as everyone's doing it
during quarantine.
## Yogurt
Why not? You need yogurt to make yogurt though. That bootstrapping
issue is something worth looking into.
## Kefir
Requires special kefir grains. Exotic!
## Kombucha
Another exotic choice. The bacteria make me uneasy though, people
managed poisoning themselves with it.
## Cider
This takes a lot of time, a cellar and special equipment. So nothing
for my apartment. A shame, I enjoy the apple flavor (which is most
likely artificial anyway).
