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.
The class is constructed by Meyer Werft of Germany. At present, there are five active Solstice-class ships: the lead vessel of the class, Celebrity Solstice; the second ship of the class, Celebrity Equinox; and the third ship of the class, Celebrity Eclipse, which was delivered on 15 April 2010.