It is known that our body needs from 1.5 to 2 liters of water daily, and that it contains 70% of water and always needs a refill. You should drink the recommended amount of water during the whole day. According to your weight, you need to drink 0.3 liters per 10 kilograms.
It is recommended to drink sparkling water if you are tired or stressed. The carbon dioxide, or more precisely its component hydrate carbonate, that is contained in sparkling water helps to balance the bases and acids in the body. Drink regular water if you suffer from stomach problems, because the carbon dioxide can also increase the acids in the body.