I already grow a reasonable amount of my own veges. Have enough preserved tomatoes to last at least a year. Grow corn, zucchini, pumpkins, beans, garlic, etc. It's not too hard. Helps if you're not stuck in a city though which was why I deliberately moved to the country years ago. I don't expect the supermarkets to empty out here though. Well, at least there will be stores that will sell food but maybe not the normal supermarkets. I expect the normal supermarkets to try and bring in some sort of vaxx passport thing though. Buying food (veges, meat, milk) direct from farms will also be an option.