What is the best way for maintaining a cold cool box whilst spending several months on the road, when you're spending nights in motels or camp sites? How easy is it going to be to re-freeze the cold block in your cool box/bag? Would you suggest using something different? I don't know what you guys use over in America, but in the UK we have boxes and bags that can be filled with food and drink which are kept cool due to the frozen, plastic-wrapped block of ice.

I'm just thinking of money-saving ideas for when I'm on my road trip. If I can eat out of a cool box instead of restaurants all the time, surely I must save some $$$.

Thanks