I am worried my trip will be ruined by maggots and mushrooms growing in my liquid nitrogen dipped shopping list.

ice cream, shrimp, sour cream, liver

Fruits and vegetables tend to go bad during my trips. Canned vegetables might not taste as good as the real deal but the bugs wo not be able to get them. Stay away from seafood too. l never personally brought any but I've seen nearby campers getting sick. If you want fish, then go fishing. Bugs will eat anything so prepare your food as quickly and thoroughly as you can and put it away as soon as possible. Once a few come to your campsite, more and more will come.