I actually called NCL and asked them about the water. They said you are allowed 1 six pack per person in your cabin. My husband and I are going with our two kids so we are going to bring a case of water with us.
In reality, there is no good reason to lug any bottled water on to the ship. I guess not a lot of people are aware that the tap water on board a cruise ship is as good, if not much better, than any brand of bottled water. The water is highly filtered and conditioned using RO technology.
I am very picky about water and have never had an issue with tap water on a cruise ship. I have heard some people claim the tap water make their feet swell and other maladies, but I suspect it has nothing to do with the water.
The only reason I could see having bottled water is to get a bottle to fill with tap water. They are handy containers.
Try the tap water, I bet you a dime you'll like it.
As a child, a library card takes you to exotic, faraway places. When you're grown up, a credit card does it.
-- Sam Ewing (Readers Digest, Dec, 1997)
I agree that illness can come from many sources.
I drink shots with bottled chasers when I'm abroad.
The purification system (desalination, filtering, RO, etc.) occurs BEFORE the water is put into potable water storage tanks. From that point pumps take over to pressurize the system.
Even the brominating system that ensures an acceptable FAC does its work long before the water hits your tap.
No doubt that 99,9999% of the water your ship will MAKE is quite safe.
I watch the news, been below....taking my own bottles.
You'll probably be fine.
Peace through superior firepower.