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I've only tasted the bottled stuff which was so bad I haven't had the desire to ever taste квас again. But I guess I should try the fresh stuff......

Yup. There's one always parked near my metro station.

You can buy kvas at the yellow tanks (kind of a small tankard on a trailor, the tank is yellow and has КВАС printed in large letters on the side) parked throughout the city. You can buy it by the cup...