Said that the drinking water needs of the body per day to create balance is a water drinking with worldwide taking out per day should be equal in the normal state must drink water 8 glasses per day. (the glass for 240 CC) if drinking water 2 glass in the morning as soon as waking.Feces, urine, and nervous system will be ready to work, health will be better drinking water may have more than 8 - 10 glasses per day, if in the hot weather. Work hard, or exercise. When lack of water will feel that saliva dry.Feel thirsty indicates the body needs water. But the case exercise hard. Feel thirsty to be holding for a short time. Which should give drink enough during the first betweenBy not only the results of American feeling thirsty College of Sport Medicine (1996) was found to 37 of athletes. In spite of dehydration. But I can't feel thirsty.But we should not drink plenty of water before meals because gastric juice dilute, digestion is not good.