You can obtain kvas in Polish specialty stores--it is known as "Zur", and it is exactly what you will need for and Central European recipe. Making it is an entirely different procedure--you have to ferment rye bread in water. My great grandparents were from Poland and this is how they did it. Personally, I wouldn't mess with that, because there is the possibility of food poisoning because you ferment it over the course of days at room temperature. Anyway, that is what I know about kvas/zur--enjoy!
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