Cell phones may or may not work, depends on any damage to the cell tower.

For about $5 at truckstops you can get a self-heating meal that doesn't need refrigeration. You might want to tuck one aboard. Beef jerky is also good. I'd take several liter-sized bottles of water. If you don't need it, great -- it ain't all that expensive.

Take a blanket and pillow and couple of them great big green garbage bags, too. One of them lightsticks can be useful as well.

But hey, livin' in a car, singing the blues -- what more do you want?