Expandable waterhose?

Really, can't understand what the thinking is when people are told by scientists that the water out of a certain hose is NOT drinkable, and yet they continue to do so. Not a smart move in my mind. I just look at it this way, if a hose is made in a 3rd world country with weak consumer protection, like China, AND, it's marked 'Not for Potable water', I'm not going to be filling my tank using it.

I would like to have one for other purposes though. I'd like to try one for washing the RV and such.