Water is essential for our body to function. Water is about 80% of an infant's weight, 70% in adults and 60% in the elder. One can go quite a few days without food, but no one lasts longer than 3 to 5 days without water. Chronic dehydration is very common and it might be the root cause of many illness and diseases.
Dehydration occurs when the body receives less water than it required. When your body lacks water:
- By 1%, you experience extreme thirst. Your mouth is dry. By now, your body started to malfunction. Never wait until you feel thirsty to drink water.
- By 5% , it can cause a slight fever.
- By 8% , your glands will stop producing saliva, skin starts to turn blue
- By 10%, your tongue swells, your kidneys start to fail, muscles go into spasms and you have trouble walking.
- When you are 10% short of water, your skin will crack, organs will grind to a halt, which can lead to death.
Why is water important to humans?
1. The majority of cells in the body are made up of water
2. Water is the major constituent of  sweat, tears, and saliva
3. It is indispensable for the functioning of the blood
and lymph systems. It helps to carry food and oxygen to the cells and to eliminate waste from the body
4. It helps control blood pressure by maintaining a balance of the electrolytes
5. Water flushes the kidneys enabling them to get rid of toxic substances in the body
6. It helps moisten the eyes, mouth, and nasal passages
7. It regulates the body temperature.
8. It also acts as a shock absorber cushioning the body's organs
9. It lubricates joints so you can move without pains
10. Water can provide many of the trace minerals that the body needs
We need water not only for drinking, but for a number of other tasks. We need water to cook, to wash, to clean, to flush, to grow, etc. While 70%  of the Earth's surface is covered with water, only about 2% of it is fresh water. This means water must be used judiciously and conserved if our future generations are to have drinking water.
About 70% of the bodies' weight is water. Water is accountable for many body functions. Drinking enough clean water not only improves your overall health and well-being, it may also prevent many ailments and sicknesses. Give your body the quantity of water it deserves and you will stay fit and healthy.