Dont make it more difficult than it has to be. Although there are plenty of good companies out there, dont fall victim to the hype and saturation marketing that occurs each election cycle. Stick to the baiscs... here are just a couple of bullet points
1. Water water water
1a. a way to sanitize water, and carry water. I like 7gal aquatainers for storage and mobility. Something larger than the standard 35 gallon water heater would be another boost.
2. Store shelf stable foods that do not require any special storage
2a. Kippered Herring, Tuna, Peanut butter, dried fruits and nuts,
Dehydrated meats, beans and eggs, steel cut oats, quinoa, DAK ham
Datrex food bricks
I like getting stuff from Honeyville farms and the neighborhood grocery
A firearm can certainly be a part of any survival system but lack of a firearm is probably not going to be the primary peril in any sustained crisis here in the States. It will likely be related to lack of food, water, medicine or proper shelter. These people who are hoarding tons ammo and crap like that are likely missing the boat.