I ask for water all the time when I'm cruising...always with a mixed drink though.
Me too, but with a glass of wine. I like to stay hydrated. I do the same thing at home when I go out to dinner, or meet friends at a bar for a drink or two. I've never considered it rude, and actually I think it is quite common here in NY. I would expect (at least) the same level of service on the ship as I get back home in a restaurant or bar.
IMAGINATION - February 2007
MIRACLE - February 2008
ROYAL CARIBBEAN - February 2009
PRIDE - February 2010
DREAM - February 2011
VICTORY - February 2012
GO AHEAD TOURS (LONDON, PARIS, ROME) July 2013 - Daughter's graduation trip