Sourdough for kvass from dry kvass

To begin with, we will prepare the necessary dishes, for example, a perfume or a three-liter jar. Pour dry kvass into it and pour boiling water.
The next stage of cooking is waiting. Cover the jar with a lid and leave it for a couple of hours. It is necessary that the liquid remains warm, but it is no longer hot - about 30 degrees.
When the liquid cools down to the required temperature, add the prepared sugar to it. Mix all the ingredients thoroughly. We close the jar with a lid again.
In a separate bowl (I took an ordinary glass), pour dry yeast and dilute them with half a glass of liquid from the jar. Diluted, thoroughly mixed yeast is added to the jar.
After mixing all the ingredients, cover the jar with a napkin, but so tightly that insects do not get to the kvass. Observing this rule, we leave the kvass for two days in a warm place.
After two days, we drain the young kvass into another container. The leaven remaining at the bottom of the jar can be used in subsequent preparations of the drink. It must be stored in the refrigerator.
The first time it turns out about two liters of drink, and then each time the leaven becomes more and more and you can cook kvass in large volumes.

Prepare a soft drink with pleasure!