I have tried many sports drinks: Gatorade, Gookinaid, Hammer products, and Nuun. The last one is my favorite. Nuun comes in a tablet form. A very large tablet. Simply drop the tablet into 16 oz of water and within two minutes, you have a non-carbonated, no-sugar, sports drink. It comes in four flavors (the cola flavor is caffeinated), but I like the tri-berry the best. The best part of course is that it’s sugar free. Each serving (which is half a tablet) contains less than 3 calories! One downside is that the tablets are just a tad too big for most bottled water openings, but they can be forced. If you’re using a re-usable water bottle, then it’s no problem.