[ZhongXina]

This

https://en.wikipedia.org/wiki/Kvass

is pretty popular in many former USSR states, and can be easily made at home. I have no idea if you will like the taste, I'm used to it from childhood. It has 1-2% alcohol and gives a slight buzz if you drink liters of it (which I tend to do in summer).

[SOLAR_FIELDS]

Interesting. I don’t typically like the flavor profile of beverages like kombucha but do like sour beers so this is worth a shot. Thanks!