Where I live I would half to walk about a half day to get to the nearest place that sells any kind of food and back, which is a 7/11 gas station. To get to a real grocery store and return would require a full day's travel on foot (just checked google maps, 4.5 hours one-way to the closest one). There is no public transportation option at all, the only buses are school buses until you get much closer to a major city. Driving is a necessity in such places.

I live in a well populated East Coast state, so it's not like I'm even really far out in the sticks too, there are many places which are even worse off in these regards.