Remember that preparedness isn't really about the ending of society as we know it. As much as I love a good zombie flick, they're not the cause of my prepping.
What do you do if the power goes out for a few days? What if you're snowed in for a similar period of time? These are the types of situations that you should begin to prepare for. You can then begin to build from a week to a month to a year. Getting into longer periods of time though is going to cause issues with storage and transportation.
Bugging out, as fantastic as the idea can be, simply isn't reasonable for those of us without somewhere to actually go. Plan on staying with the ability to go mobile quickly and also figure out where you'd be going or it's going to be a rough time finding a camping spot.