Originally Posted by
ianfly
A quick google search of “plane tap water” should tell you why you should avoid drinking any water from plane tanks - they’re hardly ever cleaned and full of bacteria
I've always assumed airlines serve tap water when there's a delay and they want to give everyone some water. Also, I'm pretty sure all the tea and coffee I used to have wasn't made with mineral water (and not with boiled water either, just warmed). I reckon if I google "tap water in <insert city>" will also return loads of hits from people saying they wouldn't drink it.