I work in emergency management. I'm on the "keep beer in fridge" end of the scale but I know people who bury containers of goods for trade (rimfire for varmint hunting popular for this). It really is a continuum.
Best advice: keep a full tank of gas, food in a chest freezer with ice packs, and 1 gallon of water per person per day. You will be expected to make it for 3 days without assistance. Full marks if you plan for a week which includes a heat source for warmth and cooking.