If there was a full blown nuclear war, it would be like going back to the stone age.
No safe water, energy, medicine, food, everything would be polluted and destroyed. To rebuild even basic services would take decades. On top of that survivors fighting one anther. Umm, no thanks.
I don't stock pile, if I ate up everything in the cupboard, freezer, splitting up the food to make a meal, it would last a couple of weeks. I like to buy and use up food rather than store in the freezer for months. You could theoretically stretch it out to weeks if portioning to survive.