Man, I can't imagine the taste of milk and gatorade, I think it would be pretty foul. But nutritionaly, it wouldn't be bad. Also, powdered milk is maybe one of the cheapest protien powders out their. Mixing it with whey might have a decent effect. I know why is digested pretty fast, milk takes a little longer. Plus, the lactose in milk adds some much needed PWO carbs, and mixed with Gatorade you should be on the right track.