I've said it before, and I'll say it again, Toilet Paper* and Bullets - lots and lots of both! Be sure to diversify with a mix of high and low quality TP and a variety of common bullet calibers (mostly 22, 38, 357, 9mm, 45acp, 556/223, 762, and 308, with as a smattering of 40cal, 30-06, 30-30...