I read your recent article on diabetes management with much interest, as I am a 64 year old diabetic myself. The problem with being insulin-dependent is access to insulin after things crash.
Walmart (of all places) sells Relion Diabetes management products, which include insulin over the counter with no prescription needed. Relion makes different insulins that are equal to the same insulins that sell for over $250 per bottle at the pharmacy.
Their insulins are very reasonable at $28.44 per 10ml vial. I went to my local Walmart in Michigan, and sure enough I was able to buy Relion Novolin R (to replace my Humulin R) with no questions asked!
The pharmacist told me I could buy up to four bottles at a time, and the expiration date of the product I purchased on 4/5/2017 is April of 2019! Relion has a full line of diabetes management products that are ridiculously inexpensive with no prescription needed!
A long term prepper could buy four vials of insulin every few weeks or months and build up a very nice supply that would last years.
In some states, like Indiana, a prescription is needed, but in many it is not. Check your local Walmart. – J.C.