I cruised in 2000. Now I will be doing it again. At home and while travelling, I need to drink purified water. Not a spring water kind of person. I will drink tap water if I know it has been filtered. While cruising on Carnival in 2000 I watched a ships video of how they filtered the water. By day two I was no longer buying bottled water, but instead reusing the bottles I had. I just pre-paid for a case of water to be in my room. $55. Not sure it is even filtered water. Can anyone tell me anything about the tap water on the ship? I appreciate you help.