I like to think I'm in pretty decent shape, competed to and qualified for nationals in powerlifting not too many years ago. Do plenty of 20km mountain days, and have hiked around 40 degree neighbourhoods of Africa a good deal, and not far off that spots in the Amazon. I have never, ever drank that junk. It's overpriced sugar water and the much touted "electrolytes" is a bunch of marketing mumbo jumbo for likely 95% of applications. I've noticed many friends of mine who swear by it are packing an extra twenty pounds they likely shouldn't be. Water is great stuff, a lick of salt if you've really overdone it and dehydrated yourself (seen salt required twice in my life). For a good synopsis on Gatorade and electrolytes see the movie "Idiocracy" for some good commentary.