We have just been shopping in two supermarkets - the amount of panic buying we witnessed made us laugh. It is really rather silly.
I lived through World War II and we were rationed to 2oz of butter, 2oz cheese, 2oz of tea and 4oz of meat per week.
We also had 8oz sugar, one egg, and 4oz of preserves every two months.
There were no bananas or oranges. Cabbages and root vegetables were available and onions hard to get but we did not just survive, we were actually a darn sight healthier than we are today, judging by some of the people waddling around the supermarket.
The food will always be there and you will always be able to get at it.