fighters dont usualy drink sports drinks, just water. like boxing how they squirt water in their mouths n spit it out? maybe they drink some but like said above, a tummy full of water sloshing around isnt helpful.
I don't think so. Gatorade is awful sticky (and just tastes awful in my opinion). If you notice, they don't drink much of anything- just enough to get the mouth quenched. You don't wanna roll around with a belly full of liquid, it's very unpleasant.