Greg, how serious do you consider preparedness? May I be honest. It starts with realizing that you are not capable of preparing for any possible situation. You can make a sincere and accurate risk assessment of what threats you reasonably expect, yet there are still possibilities that can surprise you. Look around you, for a start, and ask yourself what real problems could happen? Most disasters, whether man made or natural, carry the same consequence to you. When you talk about disaster preparedness, you are generally looking at steps that might secure your ability to deal with an immediate or very short term disruption in your life. Let's say you suffer a storm that shuts down your county for a month, or a terrorist event that isolates your family at home for a month. You can start to see that the steps for preparing will be common to each, and beyond this, you see that you are simply preparing to maintain yourself for a relatively short period of time until the disruption is past. Your food supply is expected to be reasonably restored. You just need to survive until then. You need to be able protect your health, security, shelter etc for not more than a month or so. As this relates to you food and water, you most likely would maintain a supply of canned or packed food to feed yourself and family until life services are restored and bottled water etc. When you start talking about terms of time beyond that, you start talking about doomsday prepping, which is a next level beyond simply preparing for a disaster. This is where you start talking about those Heirloom seed packs and serious lifestyle changes that will likely be at least semi permanent. This is the level where you start talking about replenishable food and water, shelter that doesn't depend on the grid and security after society breaks down. This is what people payed for the 1950's absorbtion refrigerator/freezer that can be used off a propane tank for. Basically, you have to determine what threats you are preparing for, and how long you expect to be affected. BTW, if you are doomsday prepping, you pretty much need to start living that life under current conditions.
Put a different way, a large tote box filled with canned food and dry goods is disaster preparedness. A 28' Conex box filled with pallets of MRE's is doomsday prepping. Mind you, there is nothing wrong with doomsday prepping. I just want you to understand that if you are at that level, you need to realize that you have whole lifestyle changes that come with that. If you are concerned that a grave threat exist that requires such a preparedness, I hope you are also staying in top physical shape, as medical care will never be available. You obviously don't want to face such with a two and a half pack a day smoking habit. You see where I am going with this? Disaster preparedness is a well thought box in the corner, some extra batteries for the flashlight and a heater that doesn't need electricity. Doomsday prepping is a change to how you live life, even now.