I personally am not into Kvas. But when I went to Russia 12 years ago with some students we found a Kvas tanker truck (looks like a big gasoline truck with a spout) and people could go up there and bring their bottles and fill them for a small charge. Someone had a plastic Evian bottle and they filled it for what cost in blackmarket-traded kopecks the equivalent of U.S. $0.01. Well, in my opinion, it cost what it was worth.
But hey in Iran they drink plain yogurt soda so to each his own!!!
Keep in mind that the King Of Pop\'s crown is not made from a bunch of melted aluminum cans!