This whole "water" thing is crazy in my mind. I have been here, okay close to two decades, and the tap water is fine in my book! Used to own a water utility in the US and, just like there and here, if they work on the line and the water looks murky I avoid it until the line gets flushed out.

That said, any restaurateur that refuses to give you a glass of tap water if requested is just too darned greedy!