Here’s what you should do:
1.) Start slashing any and all expenses that you possibly can.
2.) If you have any medical issues you’ve been putting off (say, a trip to the dentist), get them done now. A general medical check up would be a good idea in any case, so that you can better manage your health if you’re going to be spending any time without health insurance.
3.) Trackdown all the various aid agencies which could help you were you to be laid off, and the moment you get laid off, start the process to getting that aid (it take take up to 45 days or longer to get foodstamps, the sooner you start, the sooner you’ll be able to get them if you need them, and be prepared to have huge amounts of documentation with you when you apply for foodstamps).
4.) Do you have any repairs to your car (say you’re going to need new tires in a few months) or apartment that you’ve been putting off for one reason or another? Might want to look at getting them taken care of now. (Don’t worry about cosmetics, but that leaky faucet will turn into an expensive repair when you can least afford it.)
5.) Take inventory of everything you have. Decide what you can live without, what can be sold on eBay/Craigslist, and what you really need.
6.) Start writing and rewriting your resume now (one should do this ever few months anyway), and have multiple versions, each one tailored to different kinds of positions that you could fill.
7.) Find and bookmark all job related websites.
8.) Look what your educational options are. Can you pick up some extra certifications quickly? They’ll make your resume look better as well as open potential networking options.
9.) Keep a diary about what you do at work, this will help you remember things when it comes interview time.