Definitely Do Not Accept A Coffee
Many flight attendants do not suggest drinking the coffee or tea served on flights. Although drinking water is filtered and may not necessarily be the same as the water that passes through the toilets, you may wish to let these hot beverages prepared in-flight pass through.
Tanks in which drinking water is stored are apparently not cleaned as often as you might think. Moreover, sometimes the valve for the water in the washbasins is located very close to the valve for clean water. So next time, you might just want to stick to bottled and canned drinks. The flight attendants will have to intervene if you behave badly and if you become uncomfortable during the flight as well. Why not take advantage of the flight to get some sleep?