Seeds! Seeds for several years of garden, if you can properly store them.
Canning supplies.
Batteries
a year's supply of anything you are addicted to, like if you are used to eating a chocolate candybar once a day, you better stock up. Cigarrettes if you are used to smoking them, unless you plan to quit cold turkey!! that will be rough, too.
Cast iron cookware, incase you have to cook over open fires.
Non perishable foods.
Animal feed.
Toilet Paper...and when that runs out, use tree leaves...big ones like Maple leaves..watch out for poison ivy.
Sugar and flour. Honey! When the sugar runs out you can sweeten with honey.
Learn to bake bread if you don't already know. Stock pile Peanut butter...it has a long shelf life.
Buy canned foods.