Transportation is the key to food.
Without transportation, farmers can’t get their crops to the wholesalers or food processing facilities. Food is heavy, generally speaking, and it requires trucks and trains to move it around— a literal ARMY of trucks and trains, weaving their way from city to city, optimized and prioritized by computers. If the computers freeze, the whole transportation infrastructure will shut down. Transportation also depends heavily on fuel. In a time of crisis there may be little or no fuel to use.
How would you feed your Family if you could not run to the Grocery Store to get food?
Grow your own!