For hydration after easy exercise, Coco Libre has all the potassium of other coconut water-based drinks, but with far less sugar. As such, the 1-liter Tetra Pak carton is perfect for sipping throughout a workout, not just as a replenisher afterwards. One tester kept a jug of Coco Libre in his fridge at home and tossed some down during breaks from sanding his deck on a blazing-hot Saturday. Stick to the Original flavor; we thought Pineapple was too sweet. [$25 for a 12-pack; cocolibreorganic.com]