How many litter of water should I drinking per day?

Depends. It is always wise to eat your water by having 6 servings of fresh vegetables raw or lightly steamed and at least one fruit every day which are 90 % water but also have electrolytes and nutrients. Soups are a good source of water in the winter. Iif you are sweating a lot you need more water but a hydrating solution is better. If your urine is concentrated drink enough water for it to be light.