We drink liquid bread

Kvass is a traditional fermented Slavic and Baltic beverage commonly made from rye bread, which is known in many Central and Eastern European and Asian countries as "black bread". The colour of the bread used contributes to the colour of the resulting drink. Kvass is classified as a "non-alcoholic" drink by Ukrainian, Belarusian, Russian, Latvian, Lithuanian, Polish, Serbian, and Romanian standards, as the alcohol content from fermentation is typically low (0.5–1.0% or 1–2 proof). It may be flavoured with fruits such as strawberries or raisins, or with herbs such as mint.