Avoid plane water
Flight attendants begin most flights serving bottled water, but if they turn to the plane's onboard tanks, there may be cause for concern. According to the most recent available EPA study, one out of every six planes had coliform bacteria in its water tanks. Since 2004, the agency has ordered 46 domestic airlines to regularly flush, disinfect, and test their water systems. Richard Naylor, the EPA's Aircraft Drinking Water Rule manager, suggests that concerned passengers avoid drinking coffee or tea on board (water may not reach a cleansing boil). Also avoid using bathroom tap water (use wipes or mouthwash). For a long flight, Corey Caldwell, a spokesperson for the Association of Flight Attendants, in Washington, D.C., advises opting for canned drinks or stocking up on water after clearing security.