In the movies the disaster wipes everyone out but leaves their stuff. Real world disasters are more likely to look like the Great Depression. Lots of very poor people scrounging to get by for 10 years or more. It's a grim thought.
Having a good water source, a big garden, and the means to get by without any utilities are probably going to do you the most good. You seem well prepared on those fronts.
Our biggest area of lacking at the moment is electricity. I really want to move on some PV & battery capacity as soon as the funds appear - part of why I joined steem to earn and save for that...
How little electricity can you live with and what are the most critical uses? It is probably easy to imagine how you could cut way down on your electricity use if it was an emergency. For us, it would mean using non-electric heat and just living without A/C. A small PV/battery system for LED lights would be easy to justify. Our well pump draws a huge amount of current, though. We would probably need to pump water by hand. Refrigeration is on the bubble for me - for a short term outage of a month or two I can use a gasoline generator. If we were without power for a decade, though, I don't know if it is possible to keep a refrigerator working. A giant bag of salt might be a better emergency resource than a generator in the long run.