The Subterra Castle covers 34 acres of estate, including an airstrip, and other facilities. The silo which was bought by Ed Peden for only $40,000 transformed this former junk heap to a modern day castle. The complex tunnels of the site stays 10-15 feet underground. The family just needs to make sure they stock up with emergency food and other basic needs, then they can sleep well knowing that they are safe from almost everything.
I know that you two are really heavily focused on gear, but I think something like having a solid stock of mason jars (various sizes) to fill with preserves would be a far better option then your plastic air tight sealing bags that will quickly run out in most situations. Why not just use ziplock bags if you must? For that matter, you’d probably want to have a big pot and a few key tools to cook your preserving in.
This is a very basic guide to bunkers. Many areas such as bomb blast related pressure as it relates to entry door integrity really deserve much more coverage. And the section on construction techniques completely miss the point on culvert strength which is primarily related to earth arching and not the strength of the culvert material - look at the huge plastic highway culverts that are a few feet underground and support multi ton trucks. This book is a start but you need much more information to plan any kind of shelter.
Still, these extraterrestrial-looking foodstuffs seem to be having something of a moment: For the past four years, Costco has been selling pallets of shriveled vegetables, fruits, grains, and meats that promise to feed a single family for up to a year—and if you’re not a member, you can purchase similar survival kits, many of which boast a 20- to 30-year shelf life, at Walmart and Target. One top seller, Wise Company, saw its sales nearly double over the past four years, reaching around $75 million, according to a Bloomberg Businessweek cover story last November. The company’s CEO, Jack Shields, told me he estimates the industry as a whole generates between $400 and $450 million annually in retail.