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, etc.)
If you remember what happened at the beginning of the Covid-19 crisis, you know how quickly TP disappeared from the store shelves. And ammo has been increasingly scarce and/or very expensive throughout the crisis.
Shop now, be ready the next crisis! Be prepared to reap the sweet, sweet rewards when the world finally comes apart. The end of days will be here sooner than you expect!
(* Just be sure to rotate your stock of TP! No worries though with the bullets, they'll be fine for many, many decades to come...)