The other question would be, “Where will you be when SHTF?”. If you are home no problem. What if you are at work or shopping etc and cannot make it back to your fortress.
I can walk home from work but what if we are at the mall and something happens where we cannot travel back to the house then what? I only keep a few survival items in the car.
I believe the S will HTF slowly.
You won’t be living a “normal” life one day and then everything goes to hell the next.
99% of SHTF events such as economic collapse, natural disaster, war and martial law should allow you enough lead time to get home and a few more days to shore up. Off hand, the only scenerio that wouldn't would be a nuke or EMP. Second, after water, of survival items in your car should be a good local map that shows the little roadways. Don't rely on a working GPS. It doesn't hurt to plan out different routes and check them out now.