Although the end of civilization as we know it would be a bit of bad luck, I'm usually a pretty lucky guy, so I'd take a few rolls of Provia (I prefer more natural colors) with the Leica M6, leaving everything else behind (except survival gear, firearms and ammo). The luck comes in when I'd meet two groups of other survivors - one that had preserved a pedal-operated Jobo outfit, and another that had a supply of E-6 chems.