Starting in GoatZ after outbreak Mode simply Switch on the mutator that u can't starve to eliminate the time pressure.
Good Food Locations:
On the Wall Mart Roof theirs a pinjata Party with loads of Sweets in it. (about 15)
in the wallmart u get about 10 appels in the apple store
whipslash buffet (also about 5-10 items)
their is a guy selling Food on the street nearby the Restaurant he has got loads of fruits and bread (about 30)
I hope those locations are quiet helpful and please comment for additional Locations :)