Why You Want to Avoid Hot Drinks When Flying

By Dr. Mercola Clean, pure water — in sufficient amounts — is one of the most important foundations for optimal health, but is becoming far more difficult to come by with each passing year. Environmental policy changes ensure ground water will suffer greater contamination with chemical pollution;1 water treatment plants don't have the resources to remove drugs and other small particles from the water before dumping into rivers and oceans;2 and in some cases, sewage is dumped directly into the environment.3,4 Most tap water is far from pure, containing a vast array of disinfection byproducts, fluoride, radiation, heavy metals, agricultural runoff, pharmaceutical drugs and perfluorooctanoic acid (PFOA), a chemical used in the production of Teflon and flame retardants.5 And that's the short list. What's worse, more than half of the 300-plus chemicals detected in U.S. drinking water are not even regulated.6 Every year new stories are released about toxic drinking water across the U.S.
http://articles.mercola.com/sites/articles/archive/2017/07/05/airplanes-tap-water-coliform-contamination.aspx