These really are my sweet spot. I'm a very cerebral person (for better and neurotic worse) and the "dumbing" effect of alcohol is sometimes welcome but often comes on too strong. ~2.5% beers are something I can enjoy.
Just pick up a small bottle of 100% pure lemon juice, add about a half the bottle to a quart of water, ymmv, and whatever (brown!) sugar and other stuff you want.
There’s nothing better than cold kvas on a hot day - shame we can’t just buy it in the supermarket here in America.