How might preparation for a societal collapse look different if you're in a city like Los Angeles? What are your thoughts on that?

For what it's worth, I've wondered how I could walk outta here if things really got that bad. Also, this all seems dependent on it not being caused by nuclear war, which frankly would make storing food meaningless since we'd all most likely be vaporized. Morbid thoughts, but that's what comes to mind.