I saw O.N.E. Coconut Water stacked high and priced low at Whole Foods a few weeks ago and decided to try it.  It's delicious and very good for you..  Coconut Water is 100% natural (drained from young coconuts), and has five essential electrolytes: calcium, potassium, phosphorous, magnesium and sodium.  It has more potassium than a banana, no fat, no cholesterol, no preservatives. With just 60 calories in an 11 oz serving, it's naturally sweet without added sugars or artificial sweeteners . Beats the pants off Gatorade and Vitamin Water, naturally ;). Find it at your local Whole Foods, or order it from amazon.com.  (Read this post to learn why Zico coconut water isn't the same!)