Fermented Kvas

Some articles on fermented kvas, kvas:

Fizz (cider) - Fermented Kvas Controversy
... Le Coq announced plans to start producing fermented kvas ... at around 0.5–0.7 percent by volume) most bottled kvas sold in Estonia is manufactured from unfermented malt or malt extract and does not contain ethanol ... Particularly contentuous was the issue of safety of fermented kvas for children ...