I can’t agree with your solution for water purification. If the argument is to “also” include scenarios where boiling isn’t practical, there are other options that fit the bill. For us, we’ve been using a Berkey filter system in our home instead of something that needs water pressure or power to serve in both bug out and Flint, MI like scenarios. We use it day to day today. Not cheap upfront but the cost per litre/gallon over time is a fraction of what you’ve proposed – with all due respect.
This is one of the items on the list we do have, and by golly it’s great. Definitely not a complete replacement for carrying a proper firesteel, and it would be good to have a better knife on you outdoors, but if you like carrying backups (as I’ve already expressed I do!) this is one of those excellent investments that delivers on its promises. Great multi-tool; but I’m not going to regurgitate information – you want more about it, check out Thomas’ review of it here.
I usually go into lists like this thinking “this person is going to prove how little they know”. But, you just proved how much you know. This list is spot-on, especially the parts about preparing both for and against human nature. IE: in a perfect “bad” situation you want to be that person that is prepared, and can help others learn how to survive by teaching them to hunt, farm, build shelter. But, in a realistic survival situation you need to protect yourself to ensure you’re not just prepping for the big dude down the street with a gun to come over and take advantage of you.
Dozens of websites and books offer advice on supplies to have on hand and in stock if "the end of the world as we know it" – TEOTWAWKI, as it's known in survivalist circles – comes to pass. Here, then, is a rundown of the supplies you'll need to ensure that this proverbial "end of days" is not an end for you and yours, but rather a new beginning. [Could Cockroaches Really Survive a Nuclear Blast?]