I always drink it after fitness, coconut water is considered the best natural alternative to sports drinks because it contains electrolytes. It is also very thirst quenching and contains few calories - here is some info about coconut juice calories and nutrients, or see this article concerning coconut water and weight loss.

http://www.amazon.com/Coco-Coconut-Water-Latte-Ounce/dp/B007JHXQQC

I treat myself to this stuff every couple months through subscribe and save. Good stuff.

It is everywhere... Safeway, Giant, 7-11...