The easiest method to preparedness is having plenty of food and water in your household supplies. First and foremost. Yet even this is easier said than done.
Prepping food must be stored correctly or it will spoil, vermin will get into it and the food will perish. This is especially the case with dried foods. Also necessary to know is how much food you will consume if the local store runs out. A lone ranger in his shack might be ok with local game, some stored water and a fresh-water creek to refill at. For a family of five the collective needs much more apparent.