The one beverage you should never, ever drink on a plane.

It’s no secret aeroplane cabins are hotbeds of all sorts yucky bugs and bacteria.

From farts to coughs and everything in between, it’s best not to think about the miscellaneous bodily fluids you may or may not be inhaling.

But the beverages are safe to consume… right?

Sadly not, according to one flight attendant (who I guess would know a thing or two about air travel).

Talking to Business Insider, the anonymous flight attendant has blown the whistle on the one beverage she never consumes in the air… and we’re shook.

Because it’s water. You know, the thing you need to survive. Before you freak out, the mini bottles of H20 are fine. It’s the tap water used to make nourishing cups of tea and coffee that could be potentially harmful.

"Flight attendants will not drink hot water on the plane," the attendant told Business Insider. "They will not drink plain coffee, and they will not drink plain tea."

This is because, although aircraft water filters are cleaned, flight attendants aren't aware of exactly when, meaning at any given moment you could be drinking contaminated water.

Which sucks because the reason people like us turn to a humble cup of tea when flying is to avoid getting dehydrated from alcohol.

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Essentially, it's a choice between the lesser of two evils. I for one would much rather a bit of a dehydrated complexion over an unknown tummy bug.

Do you tend to get sick when flying? What do you do to ensure you don't pick up any bugs in the air?