Relentless Inquiry

Yep, I've seen the Jim McDonald 'jump bag' link. I'll just say this about that: as a “Nationally Registered Wilderness EMT”, Jim McD may be able to survive with just these 'essentials'. Any of the rest of us should consider it nothing more than a subset.
It's also very much a kit for a first responder and care provider, rather than a “how can I keep from being someone who NEEDS care” self-sufficiency kit for an average citizen trying to stay out of trouble and remain helpful to those in worse straits.

That said, some *much* more useful links for the average geek are included below.

If you are a ham, keep at least one HT in your car, plus batteries; buy the battery pack that lets you use disposables if your rig comes only with a lithium pack. If you are not a ham, get a set of GMRS (like family service, but longer range/higher power) radios and keep them. Agree on frequencies to use.

In fact, make your PLAN so that you know what to do and are on the same TIMELINE.
Big quake at 5:30pm– hmm, we could both be at work, in transit from work to home, etc. Our plan might say “if major event, head directly for home”, if unable to get home, define 3 fallback locations in order. Also define comm protocols: I will monitor this repeater AND this simplex frequency. Etc. The idea is even if you are out of touch, you will have a way to get in touch OR end up at the same place at the same time EVENTUALLY.

WRT food items: make sure it's something you *will* eat, that it doesn't give you the runs (how many of us eat food routinely that we love but which doesn't agree with us?!), and that it's at least somewhat palatable if you have to eat it cold. Single serving paks are best, as you will likely have no refrigeration. That said, large bottles of juice can sit longer than you might think, and can also be shared. Try to get pure juices, no corn syrup or sugar: anyone with marginal blood sugar will be stressed enough, and oversweetened (or oversalted) items can act as diuretics, causing you to need more water.

BTW, get a WHISTLE and keep it on yr keychain. Saved lives in many quakes, as people trapped in rubble and too weak to shout could blow and signal for help. M & I both need whistles– don't think that just because we KNOW what to do that we are actually doing it. The bags I made last night are our first in umpteen years. Oh yah, and I'm overdue for a tetanus check– that's a common, and completely preventable, risk during a quake, as it's likely you will get a puncture somewhere.

General