This has likely already been asked and answered and I just missed it, so please forgive me! Since we are utilizing evaporative cooling, doesn't it make sense to maximize the amount of pad(dura-cool/whatever) that is wet but not submerged? What I am thinking of is a 2 bucket system. The bucket on top...

as mentioned, it is no problem to leave and come back...ticket stub, twenty bucks, and a reentry chit from the gate folks. screw melted ice, go get water. or, better yet, coordinate with campmates. my camp uses 55 gallon foodgrade water barrels. if campmates cant help, get in touch with other burner...