While doing regular shoppinig at the store, just purchase a couple of extra items that you are used to eating. Rotate your stock. Maybe check the health food stores for certain items for long term storage, such as canned flour, corn meal, oil, and salt, in cans, not bags that would be able survive a soaking if needed.
Salt - a very good easy way to preserve your meat from the freezer if you lose power for days. Learn ways to capture water. Some areas the water is not a problem but some places (desert) it can be a big problem. Learn your area and see what you may be able to utilize,if needed.
Collect, or learn, some real basic recipes that you can make on an open fire. Firearms of course, with ammo for food and protection, depending on where you are.
Learn some wild foods that can be utilized if needed.
As a town dweller, I'd more or less SOL without gov assistence except for self protection, except what food and water that would be on hand.
Learn basic servival skills.