Yep, Gatorade.
When I use it to hydrate from exercise I cut it back to 1/2 strength with water and then add an additional 1/4 tea table salt and 1/8 tea potassium salt per 32oz bottle of the dilute solution.
If you're not using it for rehydrating due to running or working out, then you can probably just drink gatorade straight ... but when running, because gatorade does not have quite the right osmotic concentration, it makes a pit stop in the stomach for a bit while the stomach draws in fluid to dilute ... something not as desirable in the heat of battle.
The extra sodium I add is added because processing large amounts of "fluid replacement" within the body actually takes extra sodium, both because of the notable sodium depletion and also that you are likely to be drinking extra water on-and-off, as well, and to process that water you will need proper sodium stores in the body (there is actually quite a bit of danger if this is not dealt with in serious running or swetting where you have a large amount of hydration to replace ... (ref: "water intoxication" + "death" + "marathon" + "sodium").
And for what it's worth ... I go with Gatorade over Powerade; because Powerade contains primarily fructose which makes a pit stop in the liver to get processed. Again ... potentially material if you want immediate fluid replacement due to long runs ... but probably not such an issue just trying to get rid of misc. leg cramps.