Originally Posted by el_matt
What about using dry-ice? I've never used it. but it seems like it might be a good option. Also, you could get a travel refridgerator, they just plug into a power-port.
Dry ice doesn't work in a sealed cooler. The off-gassing of CO2 will pop the lid open.
I have a Coleman six-day marine cooler that is big enough for my food, plus two gallon milk jugs of frozen water. It makes them into plastic wrapped ice blocks.