Water shouldn't be a problem. I've seen people bring a bottle of water in from ports. Also, you can fill a bottle when on the ship. There is water in the Windjammer and at the pool area. The water from your tap in the bathroom is filtered and safe to drink. I know of some people that had their favorite wine packed in there luggage. I don't know why it wasn't confiscated, maybe they aren't as strict with wine.