A non-hardcore checklist would look pretty similar to a camping checklist. I have a storage bin with this stuff that I can throw into my truck and head to the country side.
- [ ] water: a LifeStraw or some kind of filtration system and a couple storage containers (maybe 2 7-gallon containers)
- [ ] food: dried fruits, beans, rice, whatever other dry food you want to pack. if you keep it in a container in your pantry you can just eat it whenever and try to keep it replenished
- [ ] shelter: a tent
- [ ] tools: fixed blade knife, solar flash-light/lantern, fire starter, shovel, axe, rope, tarp, compass, whatever you want to grab from REI or Home Depot.
- [ ] first aid: they sell kits at REI or you can assemble your own
Keep these things in a reliable place, maybe a tote in the garage; and keep your car in good shape (gassed up, tires are good, have a flat tire kit, jumper cables, maybe a spare battery, spare gas); and you'll be pretty reasonably prepared.