Kefir

Kefir with pomegranate and acai berry is pretty good. Quite tart, but tasty. The bottle I got was a little bit carbonated, which was also nice.

Plain kefir is not as appealing. It's mostly just sour.

But if you mix it with diet lemon-lime soda, it takes like Calpico, only carbonated and without any HFCS!

So that's yummy.