newmamma not sur about the tap water as for bt as long as the sodium count is less than 20 its safe enough to use. I know none of the main irish brands are suitable but 99% of the french are good to use. we used evian, volvic or the 1 with the red label cant remember the name of it.
dont think I would use the hotel room water. probably comes from a holding tank rather than fresh
enjoy the hols