It's great y'know, in johnny foreign land you pull into an aire and see a water point with a slot for cash, there is also a disposal point for stuff from the lav !!Just above said dump is a tap that says " non pottable" meaning non drinkable----are there two separate supplies ??????????????
Being a tight fisted northerner I wipe the non pot tap with a sterile thing and fill my tank, I suppose that this is awful, but it was a German who pointed it out to us