Adults need 2,000-3,000 ml of water per day, people can get 500-1,000 ml of water by eating food, and the body produces about 300 ml of endogenous water when generating energy every day, so adults need to drink 1,500-2,000 ml of water per day to meet the basic physiological needs of the body, but this amount of water is only a basic amount. Adults drink water every day according to the season, the environment, the amount of exercise is different, if in the summer, due to the skin evaporation of water increased, it should be corresponding to the need to drink more water, in general the body lack of water in the case of the amount of urine will be reduced accordingly, this time should be supplemented with water.