Is this hypothetical?
I would probably buy eggs and bread. Bread is pretty versatile and the eggs would be for protein. I might then buy milk with whatever money is leftover. Hopefully I’d have some coffee on hand and I could have some coffee (or tea) in the mornings.
If I were in this situation, I’d either go to a food pantry or try to borrow some money from friends and family so I could buy some more interesting variety of food. Nothing luxurious, just some Greek yogurt and some fruit, like apples and oranges for fiber and vitamins.