The human body is made up of 70% water and it requires a clean and fresh supply of water throughout the day.
Water is the most abundant and essential of all available nutrients. Water helps regulate and maintain your body temperature, transports nutrients and oxygen, removes waste products, and moistens your mouth, eyes, nose, hair, skin, joints, and digestive tract. Limiting your water intake can result in dehydration, excess body fat, increased toxicity, poor muscle tone, digestive complications, elevated body temperature, fatigue, decreased performance, muscle soreness, water-retention problems, increased risk of heat-related illness, and disease. So if you don't drink sufficient water, you can impair every aspect of your physiology.

How much water should you drink every day? Nobody knows for sure and different people have different views. Some experts say that you should drink at least eight glasses of water every day; a glass of water is about 8 ounces US or about .227 kilograms. That estimate assumes that your environment is normally cool, you are about 150 pounds or about 68 kilograms, and exercise in some form, about 20 minutes a day. Another simple way to calculate your daily water intake is to consume at least 1/2 of your weight in ounces. For example, if you weight 120 lbs, drink a MINIMUM of 60 oz of fresh water.

Since every individual has different water consumption requirements and it is difficult to apply a general rule. How much water you need depends on your physical weight, your level of physical activity that day and your environmental conditions. Just remember that adequate hydration is a mandatory aspect of human and animal life.