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.
Carnival Cruise Lines offers 7-day Alaska cruises on the Carnival Miracle departing Tuesdays from Pier 91. Celebrity Cruises offers 7-day Alaska cruises on the Celebrity Solstice departing Fridays from Pier 91. Holland America Line offers 7-day cruises from Seattle to Alaska on the Amsterdam and the Westerdam. Sailings depart Saturdays and Sundays from Pier 91. Norwegian Cruise Line offers 7-day cruises from Seattle to Alaska on the NCL Jewel and the NCL Pearl. Sailings depart Saturdays and Sundays from Pier 66. Oceania Cruises offers a variety of itineraries on the Oceania Regatta departing from Pier 66