One tip I rarely see mentioned is to have a “SHTF Binder”. It should include a spreadsheet of exactly what you have stored, expiration dates, quantities, etc. Have one sheet alphabetical and another sheet listed by expiration date descending. This helps you quickly locate a particular item and will help you rotate efficiently.
In the binder, you should also have some basic info printed out (water purificiation methods/dosages, how to make charcoal, how to make soap, gold/silver amounts in U.S. coins, etc.)
The most important info to have is a collection of RECIPES that use WHAT YOU HAVE STORED. So you’ve got 500 pounds of oats...what are you going to do with them? Make oatmeal? Whole oat groats for breakfast? Oat flour? It’s really not pleasant to have all this grain stored and realize you can’t make bread because you don’t have any yeast (or baking soda, or baking powder). And yes, there’s a recipe for that. Have some recipes printed out and you’ll be far ahead of the curve.
For water have several methods to purify - “pool shock”, laundry bleach, Berkey, Katadyn, boiling, etc. As with all prepping we do the “Two is one, one is none” so we have backups for our backups. Water is especially important to get right.
Just my $0.02...