Gatorade or Water?

Whenever I hunt out west, I always use a hydration pack. I have found it is a lot easier than carrying bottles. I probably walk anywhere between 3 to 6 miles a day and it is not all level ground. We hunt from 9000ft to 11000ft in the rocky mountains and for those of you who are familiar with the rockies, you know how the terrain can range from a level meadow to a rock bar that seems impossible to climb. The bottom line is, I exert a lot of energy and it can sometimes be hard to catch my breath. So drinking plenty of fluids is a must. However, which is better for this kind of activity? Should I fill my hydration bladder with gatorade or water?