Just been looking at news sites and came across this about someone refusing to serve someone tap water. Quite quite genius. But, as if you write to someone to complain that they didn't give you tap water... I suppose the hotel dude could have said 'ok', and charged her for the cost of the the water he would usually serve minus the cost of the bottled water she would have ended up with to cover his overheads.
Good on him I say!