If thirst or hunger will overtake you in the street, we usually use not very useful products that are found in store refrigerators. But if you care about your health and shape, you should not use sweet fizzy drinks. The website 4tololo.ru writes about drinks that can satisfy your hunger without harm to the figures.
Bread kvass. The stores have a lot of types of kvass, but most of them have sugar or glucose syrup. Prepare useful kvass at home of rye bread and yeast.