I know there are quite a few things we need to be aware of that could turn our world upside down, but having clean drinkable water does not get the credit it deserves. Is this because we are so used to the water just coming out of the faucet and we take it for granted. There will never be a water shortage on this planet, but there will be a drinkable water shortage. Have a look at this article about the looming water shortage.
I do think there is a near universal “beginner’s checklist”. Regardless of where you live or what disasters tend to occur in your area (hurricanes, earthquakes, volcano eruptions), people still need the same basic supplies–water, food, medical, solid footwear and clothing. If you live in a tropical or subtropic climate like I do, your water needs will be greater than if you live in a cooler climate. I actually recommend the Texas Baptist’s Men’s water filtration system–cf. https://tbmtx.org/. You can pick up a system similar to the Big Berkey for a fraction of the cost. In terms of food, I think the author’s recommendation–that you just buy more of what you ordinarily use–is sound advise. Remember to rotate your food supplies–first in, first out. If you get a few extra cans each week, you can quickly build a three month supply of foods that your family regularly consumes. Once you get to a three-month food supply, it’s time to look into longer term food storage. I think the LDS Online Store is a great value. I think there are certain items every household should have–flashlights, extra batters, a cooler, extra ice in the freezer (I live in hurricane country), at least a shotgun and a handgun, extra ammo, a decent medical kit and so forth.
Though its light weight and long shelf life are ideal for navigating harsh conditions, freeze-dried food is probably most famous as a cultural curiosity: Like many Americans, I discovered it in a museum gift shop, gawking at the styrofoam-like ice cream that astronauts used to have for dessert. More recently, I encountered it at a disaster preparedness convention in Raleigh, North Carolina, where smiling, gray-haired preppers manned tables piled with plastic bags full of vegetables, meats, and stews.