We first introduced you to nuun, the best low-calorie hydration tablets on the market, in our 2006 Gift Guide. And trust us, nuun has only evolved since then. Not only did they add two new flavors (orange ginger and kona cola with caffeine), they introduced bigger nuun tablets for 32-ounce drinks, the size of an average Nalgene bottle. But perhaps the biggest news from nuun is the release of U natural hydration tablets. U is made with all-natural ingredients, and the company promises that you'll actually be able to pronounce all of the ingredients in the list. These tablets pack electrolytes and vitamins into three tasty flavors—goji berry green tea, lemon chai, and tangerine ginger—with only seven calories. Each tube has 16 tablets, and each tablet makes one 16-ounce drink (no bigger U nuun's yet). This is truly the perfect stocking stuffer for the on-the-go athlete in your house.
Three tubes for $23.85; uhydration.com