Maybe this should go somewhere else, but I can't quickly find another thread.
This is a free ebook/download on Survival and Austere Medicine:

https://1776patriotusa.com/survival-austere-medicine/

I quibble about the assertion (no reference given) that medicines really "expire" or lose potency, or become toxic over time (aspirin).
As presented elsewhere, expiration dates are mainly a legal way for the pharmaceutical companies to get us to buy more of their product, and ensure steady income for their company and stockholders:

https://www.health.harvard.edu/staying-h...xpiration-dates

Some strengths of the book include the broad array of topics, experience of the international contributors, and being unafraid to list specific brands of recommended bags/kits, etc.

I'm saving copies to my phone, laptop, Dropbox and printing off a hard copy.