Spaghetti is pretty popular, maybe pasta and pre-made / canned pasta sauces would be welcome additions? I wouldn’t overthink the nutrition, focusing on what is desirable / pleasurable is more relevant esp. with how fortified foods are these days. Maybe canned chili, boxed mac-and-cheese, hamburger helper, and other easy and tasty meals would work? Honestly I would just ask the people there what they like to eat and then stock that, if possible 😅
nuts also go rancid, not exactly “non-perishable”