DrewKaree discussed his 72 hour emergency planning.
Now lets assume it is going to be worse than that. Lets assume it is going to go Mad Max, and you (having seen the first Mad Max film) know that it is gonna be "The Road Warrior" in a matter of months.
What kind of preparations do you make?
Unlike Drew's kit, this is a FOREVER preparation. There are some rules though, your first 50 gallons of gasoline are $10 a gallon, and the price doubles each 50 gallons afterwards. And you are limited to spending money that you might actually reasonably have.
My first move would be to fill the tanks on my motorhome (70 gallons), and overstock it with as many canned goods as possible, along with tools, ammunition, and so on. I would then TOW it with my Suburban out to some property owned by my relatives and stash it as deep in the woods as I could get it. I'd be sure and pick up a lot of fuel stabilizer as well, and I'd invest in a few solar cells to charge the 12 volt system in the RV.
Then I would go back to the city and accumulate as much gas and supplies as I could before everything fell completely apart. During that time I would weld ramplates all around my Suburban in every direction, just in case.
I would try to anticipate the complete collapse by a few weeks, and get out early, I don't want people trying to kill me for the fuel in my tanks if at all possible.
The reason I would stash the RV early on is so the tracks leading into the woods would get overgrown, hopefully allowing me to hide out the first six months until the cycle gangs and looters finally run out of fuel.