Kvass is a traditional soft drink that is popular in Russia and other CIS countries. This drink is made by fermenting rye bread wort, to which various ingredients are added, such as sugar, berries, fruits, honey and spices. Kvass has a characteristic sweet taste and a slight carbonation. It is also rich in vitamins and probiotics, which makes it healthy. Kvass can be consumed as a refreshing drink in hot weather, and also used as an ingredient in the preparation of various dishes. Kvass also has historical significance, and was widespread in ancient Rus', where it was known as the drink of the gods.