A healthy adult needs to drink about 1,500 milliliters of water a day. Water is the source of life, water is involved in the composition of the human body as well as involved in various physical and chemical reaction processes in the body. Healthy adults must consume about 1500 milliliters of water a day to ensure the needs of the normal body. It is recommended to drink a small amount at a time, divided into several times, usually about 200 milliliters per time is appropriate. In hot weather, after a lot of exercise, the amount of water should be increased accordingly. The amount of water intake for special people needs to be adjusted according to the specific situation. For example, breastfeeding women need to consume between 2100-2300 ml of water a day to meet their own and their babies’ water needs. Patients with more serious heart, liver, and kidney diseases sometimes need to restrict water intake under the guidance of a doctor to help their condition recover.