Ive been to download last 4 yrs running and every year we tried taking different foods for bbq etc. Sausages n that will last for the first day/two at the most but otherwise a no go. Bread is the easiest, and then as said, tinned food is the best, beans etc, can heat up in the can on the bbq and goes with the bread, Custard i found was a good breakfast lol.
But simply, Sally hit the nail on the head, Liquid meals all the way