I have a thing for coconut water. It's delicious, hydrating, and so good for you, I've become a bit of a connoisseur. I know the bad from the good, and the difference between young coconut water, and not-so-young coconut water.
I recently tried Koh Coconut Water (2.99/$5.50) , and it is undeniably the best yet. It tastes just like a freshly-cracked open young coconut. Ever so slightly sweet and thirst-quenching, it's the taste of the Caribbean.
Koh Coconut use Thai coconuts, however, for their sweet taste and purity. Buy it from the Koh Coconut website, or at TK Maxx stores.