I thought I should make a new thread out of this before I post an answer...
We do have a well. It is currently 540 feet deep. So far it is working fine and the water table actually went up a bit in the last year, but I do have long range plans to deepen the well at least 200 feet. But for now, that is a lower priority.
Obviously, at that depth, a hand pump is not a viable solution. I do not know anybody strong enough to lift a 500 foot column of water. Plus, the amount of water we use in the early summer, a hand pump would not be practical even if our water table were shallower. (In May and June, we typically go through about 1500-2000 gallons per week.)
In our situation, the most practical solution as a backup is a windmill. Many small cattle ranches here still use windmills on the land they lease from the feds and/or state. So there is plenty of expertise for them locally. I have thought about putting one up now to be ready, just in case... But it would get in the way when we need to repair the electric well we currently have. (Something on the damn well seems to break about every 1-2 years. So being able to easily repair what we currently use is a major consideration.)
So yeah... Water and the well is probably our weakest link. But on the upside, there are plenty of options available to us in a bad situation.