I'll stay out of the hat discussion 8^)
You shouldn't starve in 7 days, but decent food will help keep you happy and functioning well.
I didn't see any cooking pots , cups, utensils .
aluminum foil?
salt & pepper?
I suggest you practice (hunting) cooking, eating out of your kit while your feet are dry. Since this is a group endeavor you should ask your fellow firemen what they like.
A bag of hardcandy ( hopjes ?) takes little room and may lift the spirits of hungry, soggy firemen waiting for you to catch some game.
Perhaps the European equivalent of the #10 cans from here:
MountainHouse Olive oil is high in calories and can be added to camp food to help increase calories.
Lee