Will society fall apart? Only if Social Security fails....
Actually, when I lived in Seattle I put together an emergecy box with flashlight, batteries, candles, sterno, a pot, iodine tabs for water purification (yuk), teabags and sugar, a couple cups and bowls, a couple campbells soups, pairs of gloves in ziplock bags, toilet paper, matches, can opener, knives spoons, forks, and a couple of instant heating MRE's (Meals Ready to Eat) I got from an army-surpluss store.
It's a lot like packing up your troubles in your old kit bag. It takes a lot of the worry of disasterous events taking place and not being prepared.
From our days cruising we have packets of water, instant food, and a plethera of emergency gear, most at home.
In the garage we have camping gear including a propane stove, and bottles of propane.
Don't forget the water heater! Shut off the intake and you have up to 55 gallons of hopefully untainted water.
We used to buy extensively backlogged food, but with the kitchen remodel (much larger storage capacity) we decided some of our hoarding behaviour needed modified, so we don't buy and store as much. We can still eat well for 3 or 4 weeks even when it is grocery time! A lot of this behaviour is that if we want something we don't want to run to the grocery store to buy just that one item.