1 . Stage
We cut the bread. We make crackers. We fill them with a three-liter jar of boiled hot water.
2 . Stage
Add sugar. Add yeast. Stir the contents of the jar.
3 . Stage
We close it with gauze folded in several layers, fix it with an elastic band. We put in a warm place and cover with a cloth.
4 . Stage
We stand kvass for 2 days. Then put it in the refrigerator. When the kvass is cooled, strain it and we can add sugar to taste.