1) Water (H2o) is Nature’s remedy – the premium fuel your body needs.
All the important juices of the body are composed of fluids, of which water is the basis. Not only is the blood, which is the very essence of physical life, composed largely of water, but also the bile, the gastric juices, the pancreatic fluid and all the other juices of the digestive organs, as well as the saliva, or fluids of which water is the basis.
A Healthy Human Body is 70 to 80% H2o.
The very cells composing the body are virtually and actually marine organisms – tiny aquatic animals in fact – capable of existence only when surrounded by a saline solution of water (H2o).
One can go without food for a number of days, but deprived of water they will perish quickly. Water is one of the most urgently demanded of nature supplies, and next to air is the one upon which the continuance of life is based. (( Hindu Yogi practical water cure – Yogi Ramacharaka))
A guideline for water intake: drink half your body weight (in pounds) in ounces of water; i.e. if you weigh 150 pounds, drink 75 ounces – in kilos, drink about 3% of your weight in kilograms; i.e. If you weigh 68 kg, drink about 2 litres of water. ((Dr. Dean’s Supplement Recommendations – Carolyn Dean MD ND))

2) There are only three ways to clean drinking water