Lots of good information on here, especially some of the things I had never thought about like bleach and vinegar.
I heard somewhere that the Mormons are really big on keeping food and supplies stored to last at least three months. They sell to the public and you can buy in bulk from them. I have never compared their prices, but think they have a lot of research into this for what works.
https://www.lds.org/topics/food-storage?lang=eng
One of the worse things that I think happened to the idea of being prepared was that show on TV about preppers. Every one of them was an end of the world nut job wanting to be rambo during a zombie movie fighting off hordes of invaders. The stupid factor made it impossible to watch for very long, and very disappointing. I was looking for real world ideas to get through natural disasters or at least something reasonable that might happen. Now when you talk about prepping, it's almost like admitting you are afraid of being kidnapped by aliens instead of being responsible in planning ahead to take care of your family and livestock in case something happens.