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The colourless, transparent liquid occurring on earth as rivers, lakes etc and falling as rain. It's a compound of hydrogen and oxygen. After oxygen, it's the principal requirement of the human body. Much of the water we consume is contained in our food intact - potatoes, for examples, are 80% water.
Water may carry germs, algae, scale and rust particles, which can contaminate the blood and lymph, overburdening the liver and kidneys with poisons. Since the purity of water is constantly in our minds, advertisers have been quick to promote bottled waters - most of which are less-strictly controlled than British tap water.
An interesting book 'Your Body's Many Cries For Water' by Dr. F. Batmanghellidj presents the concept that chronic dehydration of body cells can cause many diseases; and says many common ailments - such as stomach ulcers and arthritis - can be cured by drinking 2 litres of water a day. For more information on nutrition see 'Nutrients A to Z' by Dr. Michael Sharon.