I view prepping as a pyramid. At the bottom are supplies, in the middle are tools, and at the top is knowledge. With the right tools you can acquire all the supplies you need, and with the right knowledge you can acquire all the tools you need.
It's just my opinion but I think sometimes people are a little bit too focused on stockpiling goods. In a real doomsday scenario, there is no guarantee you will have access to your stockpile or be able to stay in that location. So, you should also stockpile the knowledge of how to make tools and how to use tools to acquire resources.
There's no harm in stockpiling supplies of course, but one should also have a bug-out bag ready to go. Personally, I'm a fan of a lightweight bag. Mine would include a couple days worth of water, some high-value food, a very small hygiene/first aid kit and a good knife. That's it. Maybe 10 pounds worth.