Coconut Liquid and Rehydration

Today, Sarah Stegall, Bryony's web administrator and the "voice" of Bryony (most days) on Facebook, posed an interesting question: The liquid inside young coconuts can be used as substitute for blood plasma. True or False?

After reading the ensuing comment, I scurried to the search engines where I found a variety of opinions on blogs and forums (alas, Snopes only had scant info and only on its forum). I found the best answer in the link below:

http://www.npr.org/blogs/health/2011/08/15/139638930/saved-by-the-coconut-water-parsing-coconut-waters-medical-claims