During one of my flights from Amsterdam to Detroit by NW Airlines in 2001, I requested the cabin crew for water. I shocked to hear from her that I can drink the water from toilet taps! I told her it is not fair to treat like that (toilet water might be fit for dringking but we Indians dont have that dirty practice)! If an American or English persons asks for drinks, they would be served even multiple times. I was really pizzed off by the treatment.