First of all, how close is the closest non-super market? I mean, I could say "omg I've got to drive 20 miles to get to the nearest Costco" but that doesn't give me an excuse to pretend the Lidl in walking distance doesn't exist.

Second, even if there really isn't any way to get groceries without driving 25 km, just because some particular town is designed stupidly and lacks necessary services locally now, doesn't mean it has to be that way in the future. It's somebody's fuck-up that needs to be fixed, not an immutable natural law inherent to how small towns work.