From the viewpoint of Ayurveda, water is a powerful source of energy that will prevent apathy and give a charge of vivacity. A glass of warm water in the morning helps you to wake up and in the evening it helps you to calm.
Water consumed before and after the meal in various ways affects the digestive process. The Vedas say that digestion is based on burning. Food is digested by the fire, so it is like «fire in the stomach.» If we drink before the meal, water extinguishes fire and prevents overeating. Moderate amounts of water during meals help to digest food. According to Ayurveda, you should drink the definite amount of water to fill the stomach by one quarter. If you want to lose weight, you should drink water before dinner, and if you want to keep your weight, drink water during the meal. But you should not drink water immediately after a meal: the fire of digestive goes out slowly, which is undesirable for the body.