Even if you can go on for about two weeks without eating anything, you will eventually die if you don’t eat any longer. Your survival food kit must include instant foods because obviously you don’t have time to go to the kitchen and cook your favorite meals. Obviously, this food won’t last for long so go for survival seeds.
I’m sure you must be aware of the basic farming techniques. Just apply them and grow your own food because you can’t rush to the supermarket now to buy all the groceries. It is understandable that you might fail initially because of a wrong move but, you’ll learn gradually. Don’t think of it as a trouble; just consider you have found yourself a new hobby when the whole world is trying to save their lives.