All of the below is just my opinion and if any of these statements are considered innacurate or someone has a strong opinion that differs please post it so that I may learn but don't bother to take offense that was not meant.1) Water - 2 or more gallons per person per day. Used for drinking and sanitation.
2) Defense - Whatever is allowable and fortifications
3) Communications - I prefer Ham over cell but make sure it has reach and runs on batteries. It will not be sufficient to listen you will want to talk as well.
4) Sanitation - Have a honey bucket (5 gallon pail with toilet lid is minimal) and have some bio-blue or equivalent on hand and a large number of trash-bag liners for the pail. Plan a place for digging a trench and have a sturdy shovel available. This is critical for anything longer than a week and barely adequate for anything as long as a month. Beyond that, you will need an out-house. You will also want washing equipment - dish pan, wash-tub, wash-board, clothes line, soap, toothpaste, etc.
5) Food - For staying home nothing beats cans of beef stew and the like. These can be eaten cold, store nearly forever, survive building collapse, require no refridgeration and some are even tasty. Watch out for salt content as it will drive up you water requirements. If you have vegatables canned in water without too much salt you have increased you water storage by that much. (
Off forum topic note: - If you are preparing for a potential real long-term societal break-down type of scenario then you should become a good gardener and have food production competency proven and in-place before hand if possible.)
6) Heat - If you heat with gas or oil you won't be doing that during the crises. (or after TSHTF) install a wood stove if possible and lay in some fire-wood. If that is not possible then look into something like the
alpaca kerosene heater / cooker . These will also provide cooking facilities. If you bother with one of these then figure out how much kerosene you will likely use if it is your only heat and cooking source for a year ( or double the timeframe of the worst-case scenario for which you will prepare) and store that much somewhere.
7) Light - Real short term you can use battery-powered lights. Medium term, if you have solar generating capabilities and the sun cooperates you can continue to use battery-powered lights. Longer term, or if the sun doesn't cooperate you might be better off with candles. Real long term, you might want to consider raising bees.(for the wax to make candles - the honey's not bad either)
That's the basic minimum. If you have all of this covered and you are feeling comfortable then you should probably add water and defensive capabilities as they are probably inadequate - they always are. The most likely of these 7 to kill you is a lack of water. The most likely of these 7 to be inadequate is defense.