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Kvas is the most common drink after water and is shown as the beverage that people prefer more than water. is a medicine that saves people on hot summer days. real Russian kvas is a kvass made especially of black bread in homes. contains vitamin b and kvas http://kvas.az/  vitamin c. cold, fever and digestive problems. In Russian hospitals kvas is given as a daily drink required for each patient. known as energy drink. Since it is sugary, you can easily consume it on your diet to maintain the sugar balance.