Flavor does not matter, presentation does not matter but the food shouldn’t make you sick, and should ideally have enough calories per day for the average person to survive (2000 kcal min).
Edit: I am not in any danger of starving or malnutrition, nor am I insolvent. I’m mainly asking this question out of curiosity on how people would approach a solution :)
I’ve found Costco membership to be worth it, ymmv. If you have family at the same address (or maybe your non-campus address) you can put two people on single membership. That helps too.