Spam, vienna sausage, rice, dried beans, pkg. ramen/saimen/noodles. Canned soups, veggies.
Little by little. But if you only starting now, might be a bit late. Or you could take out a 2nd mortgage, go Costco and buy everything.
Then when the SHTF try to shoot as much chickens hanging around all over the place. Get plenty. But no wait. Everybody probably going do the same.
And yeah, agree to not advertise that you are a special forces, navy seal, bearded, sunglassed, tatooed army delta cia operative. With armor plates, RDS, ballistic helmet, boots, camouflage clothes and BVD's, with double edged combat daggers, and NVG's, parading around with your tricked up AR's.
The hunters from the West Side only going shoot you with their 30-30 lever action and take all your stuff.
Stay under the radar and don't advertise notting.