Hammer Nutrition High Energy Electrolyte Drink
I take a bottle of Hammer Nutrition HEED (High Energy Electrolyte Drink) with me on longer mountain bike rides, and I love it. It tastes a little bit on the chalky side, but I kind of like it. It's not too sweet and overpowering in flavor like lots of other options out there, and is very drinkable. It seems to do the trick for staying hydrated and energized, and people who know more behind the science of the ingredients have recommended it, as do I!