It's easy to stock up on some long-term storage foods, what people need to consider is stocking up on some sanitary items and consider having some backup water stored too. Many people die for lack of sanitation during a complete collapse rather than starving to death. Same thing with lack of clean water, you can only go about 3 days without water until you die. Rain water collection, purification and proper filtration is crucial. There are also Atmospheric Water Generators but they too need filters and it does cost to have one running 24/7. Solar panels are the best way to go, then propane and diesel fuel, although you'll have to ration energy use for the most basic appliances and utilities (refrigeration, freezers, water heater, well pump, a few strategic room lights, etc).
LIST OF ASSETS OF REAL VALUE FOR ECONOMIC COLLAPSE (UPDATED!)
hardware / basic tools / power tools / related accessories
(drill bits, nails, screws, bolts, lag bolts, nuts, washers/lock washers, etc)
older mechanical utilities / mechanical equipment / hydraulic machinery
older mechanical vehicles / trucks / RVs / farm equip
gas / diesel / fuel / stabilizer / petro-based maintenance oils
(anti-rust, greasers, chain oil, motor oil, etc)
firearms / ammunition / gun cleaner & lube / related accessories
wood burning stove / wood burning generator
lumber / wood / wood racks / lumber shack
alcohol / coffee / tobacco / etc
medical aid supplies / OTC medication / basic drugs
rural property & homestead / fertile land / organic heirloom seeds / garden supplies
livestock for food & breeding / local contacts who own livestock and-or who process meat locally
extra long-term food storage (canned, frozen, freeze-dried, air-sealed, grain, etc)
^ clear totes to secure stored foods (like sugar, flour, nuts, oatmeal etc. from mice/rats/pests)
clean water source / water purification / water filtration systems / atmospheric water generator
^ DIY rain water collection system hooked up to a filtered gutter (gutter guard)
gas and-or solar generators / solar panels / 12V deep cycle batteries / power inverters etc.
extension cords / spools of various gauge electric wire, extra fuse, ballasts, solder, etc.
boxes of matches / bic lighters / fire starter / lighter fluid
rope / twine / duct tape / superglue / cement glue / liquid nail / loctite threadlocker adhesives
extra clothing / boots / shoes / gloves / work safety gear
soap / shampoo / other sanitation supplies / toiletry
like-minded people: friends and-or family
(ONLY those you know deeply for years and can trust!)
state maps / county maps / atlas
bulk scrap metals / silver / gold
butchery books / gardening books / cook books
hardcopy survivalist guides / DIY homesteading books