Many health fanatics, however, are often surprised to hear me say that drinking purified water on a regular, daily basis is potentially dangerous. Paavo Airola wrote about the dangers of purified water in the 1970’s when it first became a fad with the health food crowd.istillation is the process in which water is boiled, evaporated and the vapor condensed. Purified or reverse osmosis water is free of dissolved minerals and, because of this, has the special property of being able to actively absorb toxic substances from the body and eliminate them.