Are you concerned about keeping the food fresh? If that's the case, then a cooler with ice packs would be great. If it's a problem not being able to serve the food warm while traveling, trying getting baby used to eating foods cool or room temperature a few times before you go is a great help.
If you'll have some way of cooking food wherever you're going, you could get a small food mill and buy whatever produce you need at a store there and make it as you need it. That way you would just have to pack what's needed for the day of traveling and then make the rest.