This is from a chemistry background, not so much from my horse experience.
It's a common misconception that electrolytes are something special. Really, its just salts dissolved in water. So as far as I know, anything that would increase salt and mineral intake should help.
Gatorade (if it was for horses) would actually work, to an extent. Gatorade is that is formulated so the salts go into your cells, "preparing" the cells for water intake. (This is why you're supposed to dilute Gatorade 1:1 with water, or take a sip of water for every sip of Gatorade.) The issue is that I don't believe it gives you minerals and salts that are necessarily good for you, just ones that easily diffuse into cells.
If other posts contradict this, ignore it completely.
"The wise man thinks he knows nothing.
The fool thinks he knows everything."