After 9-11, we made plans to get from Denver to upstate NY. Thank God we never had to go, but it was nice to know we could go somewhere.
I would add one more thing we did after 9-11. We put a list of all contact information of all family members together and distributed it to all. It includes aunts and uncles, cousins etc, even if we only see them at weddings and funerals. It is updated annually for cell phone changes and moves.
My fear is an EMP attack that wipes out all electricity, including car starters. If that happens... I mapped a route to the nearest reservoir 6 miles away, but I could only carry so much and like I said, it's Los Angeles. The streets would be teaming with zombies. I'm imagining living in my attic for weeks and weeks, waiting for the majority of the population to die off. It's a real nightmare scenario.