Food? Or that cooking at home takes more time than getting fast food? Because cooking healthy food takes the same amount of time to cook as unhealthy food, unless you’re counting microwave meals as cooking.
Second, you say that food spoils during the two weeks, and you’re right. But why not do two or three smaller trips over that period, rather than one big trip? Get the pasta, milk, eggs, cereal, or whatever lasts at the beginning, then get the stuff that goes bad quickly throughout the two weeks?