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 summer solstice occurs when the sun is directly over the Tropic of Cancer, which is located at 23.5Â° latitude North, and runs through Mexico, the Bahamas, Egypt, Saudi Arabia, India, and southern China. The sun will be directly over the Tropic of Cancer at 10:39 am MDT on June 21, 2015.