Pure spring water. Second, pure well water. When this is not available, water that has gone through reverse osmosis or distillation is fine. It would be good to check the total dissolved solids (TDS) of the water source that you drink to get an overall indicator of the water’s purity. Avoid drinking chlorinated water, it is a poison to your body, destroying your thyroid gland and healthy bacteria which is your immune system’s first shield of defence. The greater danger in chlorinated water are the byproducts when chlorine combines with organic material in the water. Some experts believe these byproducts to be over 10,000 time more toxic than the chlorine itself
In 1999, The Natural Resources Council of America published a four-year study of over one hundred bottled water brands. This research pointed out that an estimated 25 percent or more of bottled water came from a city water system, just like tap water, one third of the tested brands contained bacteria or other chemicals that exceeded the industry’s own purity guidelines.