In truth you will never be prepared. The most you can hope for is to be surrounded by the proper tools that will help you to survive situations which would otherwise prove fatal.
The first thing I would recommend is purchasing and registering a handgun and a rifle as well as acquiring a concealed weapons permit for your local area. If you cannot acquire a concealed I would suggest you move because it would seem that you are surrounded by armed criminals
With a concealed you can guarantee that if the shit hits the fan you will at least be armed with a handgun.
Get a secure armored safe for your house and fill it with ammo and food. I would suggest dried rations Very bland but can be stored forever and a day.
Maybe a motion flashlight or two. First aid supplies.

The weapon is of utmost importance however.

List some goodies you might take or might suggest....