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First, make collect birch sap, and then poured into a large bowl, bucket, jug, concrete ... add dry - apples, rosehips, roasted barley grain, dried balm - for the smell. All this is advocated in a cool place for several days. Taste and smell an unusual, good thirst quencher, and, mind you, kvass very useful for the intestine and alimentary tract. Drink to your health!