While non-potable water is primarily not intended for human consumption, as anyone who has ever showered knows, small amounts of water often are inhaled as aerosol or swallowed during showering. Indeed, scientific investigations have shown that waterborne disease can be transmitted simply through inhaling aerosolized contaminated shower water.  -   Erik Olson     Quotes
While non-potable water is primarily not intended for human consumption, as anyone who has ever showered knows, small amounts of water often are inhaled as aerosol or swallowed during showering. Indeed, scientific investigations have shown that waterborne disease can be transmitted simply through inhaling aerosolized contaminated shower water. Erik Olson