Bagged ice. Definitely your number one resource when the weather is warm!
Learn to cut your own meat! You can whack a deer into refrigerator sized pieces in pretty quick time if you are even marginally competent with a knife.
Get some heavy plastic or a cheap tarp, and you can convert the table into a cutting bench. Or you can lay some meat paper or the like on the counter to work on.
I debone, usually a quarter at a time, cut trim and wrap, then move on to the next quarter. The "quarters" are done after I strip the backstraps and tenderloins from the carcass. I can usually do a deer in an afternoon and evening, but if I can keep the carcass cool (like if it's in the fridge) I can do some each evening until it's done.
I dismantle the bones and pack them into the household garbage. A folding pruning saw with a Japanese type blade is really handy to have! Other than the saw, I use a fillet knife, a butcher knife, and my hunting knife for all the work.
It's getting tougher all the time to find a decent meat cutter for wild game. Around here there are a couple garage operators, but the nearest guy that does it commercially that I know of, is an hours drive.
Cheers
Trev