As an herbalist, I have always recommended drinking only steam distilled water to my clients. He was not alone in his advice. Water is a main component of millions of cells as well as the fluid that surrounds our cells. Water is also the primary ingredient in many of these processes. Without water, nutrients, hormones, salts, minerals etc. could not be transported throughout the body to where they are needed.
Water is also important for maintaining a constant body temperature.
It is water which keeps everything in the body in equilibrium or balance. The body needs pure water in order to function efficiently. Guess what's in your tap water. At least 34 million in the U.S. have elevated levels of arsenic in their drinking water. Even low levels of arsenic in the drinking water can lead to skin, bladder, lung and prostate cancer after years of exposure as documented in a National Academy of Sciences study.