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, the lead ship in the Solstice-Class. In 2007-2008, all of Celebrity Cruises' ships were renamed with a Celebrity prefix added to the pre-existing ship names. Celebrity Solstice, the first ship in the new Solstice class, was delivered to Celebrity on 24 October 2008. In May 2009 Galaxy was transferred to the fleet of TUI Cruises, a joint venture between Celebrity Cruises' owner Royal Caribbean International and TUI AG and renamed as Mein Schiff.