You all probably remember that at one point in the book, the main character John starts lamenting his lack of prepardness in his own household and for his own family in the event of disaster.
He fires off a list in his mind: water purification, dog food, 50lb bags of rice and flour, batteries, extra good shoes, ammunition, dog food, and on and on.
And he never stocked those things. He only came to the realization when they were all starving and suffering.
"You said "Dog food twice" ...
"Well, I like dog food" ...