Keeping your fluids up on a plane is important but some drinks should be avoided.
A flight attendant recently told Business Insider there are certain beverages that even the cabin crew won’t touch.
"Flight attendants will not drink hot water on the plane. They will not drink plain coffee, and they will not drink plain tea."
While the water tanks must be cleaned, staff aren’t sure how often this happens.
The Association of Flight Attendants-CWA responded to the claims in a statement.
"Water onboard is regulated under the Environmental Protection Agency to ensure safe drinking water on the aircraft. The Association of Flight Attendants-CWA pushed for this regulation over 15 years ago.
“The regulation gives broad discretion to airlines on how often they must test the water and flush the tanks. AFA does not believe this regulation goes far enough or is sufficiently enforced,” they said.
Additionally, a 2015 report found drinking water on board 14 Cathay Pacific aircraft was “tainted”.
In 2012, NBC 5 reported that 12 per cent of commercial aeroplanes in the U.S. had at least one positive test for coliform, a bacteria found in human faeces.