Plain coconut water is literally just the water on the inside of a coconut. So if you can get coconuts at your grocery store you can get coconut water. I also found this recipe on how to extract and flavor the water: http://www.eatnapplay.net/2013/03/04/make-your-own-coconut-water/.
About Celebrity Solstice. Celebrity Solstice is a large ship, carrying 2850 passengers and 1246 crew, and sails from Sydney, Australia and Auckland, New Zealand.
Celebrity Solstice is an amazing ship that has pretty much anything you could need. We enjoyed great dinners in the main dining room with excellent staff. Many of the destinations offered snorkeling and interesting cities to walk around.