Water is essential to good health, yet needs vary by individual. These guidelines can help ensure you drink enough fluids.
Health benefits of water
Water is your body's principal chemical component and makes up about 60 percent of your body weight. Your body depends on water to survive.
Every cell, tissue and organ in your body needs water to work properly. For example, water:
Gets rid of wastes through urination, perspiration and bowel movements
Keeps your temperature normal
Lubricates and cushions joints
Protects sensitive tissues
Lack of water can lead to dehydration — a condition that occurs when you don't have enough water in your body to carry out normal functions. Even mild dehydration can drain your energy and make you tired.
For more detail:
https://www.webmd.com/diet/features/6-reasons-to-drink-water