Simple, cheap air conditioner. You put ice in it, then turn on the fan... And you get cool air for your tent! (Don't forget a power source). You just have to keep loading it with ice! Oh, and stop grabbing the ice for your margaritas! #camping
"Line your cooler with Reflectix (aluminized bubble wrap). You can find it at most home improvement stores. It was invented to insulate homes and buildings. Smart campers came up with the idea to use Reflectix to keep the heat out and the cold air in coolers. Cut the Reflectix into pieces that fit, lining the inside of your cooler, including the top/lid. You can even throw a sheet of Reflectix over the outside of your cooler to further insulate it."