The nearest 'anything' is a good hour a way in the suburbs of Thorpton, a city of a million or so people.
The Hahn's go into Thorpton roughly every two weeks to do a 'big shop' at some of the 'big box' stores.
Two weeks is a pretty long haul. Thalia has to plan her meals very carefully.
Before leaving, James lowers an old, medium-size household refrigerator/freezer down onto the pickup truck and connects it to the battery. They fill it with the perishable foods they buy in Thorpton to keep them cold during the hour-long ride home. That way, their meats, produce and dairy might last another two weeks.