If the world turns into chaos, you need an exit strategy. You don’t want to stay in an urban area and deal with looters and criminals on a regular basis. You need to get out, away from everyone. The best way to accomplish that is to purchase land that you can flee to when the disaster strikes.
Purchase land that is in an area that you can get to during a disaster. Then, build a cabin or shelter on the land and stock it with supplies. It should be ready to go when you arrive.
You should also include a garden on the land. Be sure to go back and forth often enough to tend to your garden so it is ready when you start living there.
While land might cost some money, it is well worth the investment. It will keep you safe during an emergency situation.