What would do if you woke up one day and the whole world went into a global financial depression?

Hi all! What would do if you woke up one day and the whole world went into a global financial depression? I mean, how would you really survive every day. Where would you get important things, such as food? Imagine waking up one day, you have no job, you have lots of bills, you have no one at all to turn too for any kind of help, and you are just completely on your own. Would you go live in a cave somewhere until things would hopefully get better? Do you think it could really happen someday considering the global financial mess we're all in here in the US and all over the world? I think it'll happen someday but it probably one happen all in one day. It'll probably be a gradual thing leading up to a BIG financial catastrophe. Any answers would be appreciated. Thanks!