Regarding the water temperature - I asked the same question at my coaching class when we were discussing hydration. To the instructors knowledge (he's a trainer for the University of Iowa football team), there are no official studies relating to humans. I've also heard not to give very cold water to dogs or horses, especially after a workout.
By the way, I'm a Cyclone fan (Iowa State), not a Hawkeye. So I'm cool with you other Big 11 folks.