The other thing I want to point out is that there is a bit of redundancy to the solution and resolution of some the listed prepper mistakes. It stands to reason that a mistake doing one thing will overlap with something else, and so, for the purpose of this article, I felt it was important to maintain those small redundancies. Now that I think about that, isn’t that the prepper way?
The survivalist hard-on (yep, and I'll do it again, too) for prophylactics untouched by chemical pleasure-enhancers is the result of drilling deep (told you) into the magical properties of our latex friends. According to our research, these flexible, durable, waterproof wonders will be as much of a deciding factor in your dystopian longevity as fire and can openers.
This group stresses being able to stay alive for indefinite periods in life-threatening wilderness scenarios, including plane crashes, shipwrecks, and being lost in the woods. Concerns are: thirst, hunger, climate, terrain, health, stress, and fear. The rule of 3 is often emphasized as common practice for wilderness survival. The rule states that a human can survive: 3 minutes without air, 3 hours without shelter, 3 days without water, 3 weeks without food. 
Of all the supplies they suggest you legally or illegally procure, epinephrine sounds like the biggest stretch. We don't want to burst anyone's bubble, but if you suffer from life-threatening allergic reactions and really think you're going to survive limited food sources and practically nonexistent medical care, we've got a mint-condition fallout shelter to sell you.
A HAM radio, provided you know how to use it, turns a prepper into a vital asset in any emergency where the communication grid has gone down. They are completely reliable transceivers and are worth more than gold when the SHTF. I personally only hold a BaoFeng BF-F8HP portable HAM radio in my prepper gear as it still provides a means of two-way communication when the communication grid is down is my area, works well when I am on the move, and is much less expensive than a traditional fixed HAM radio.
Common preparations include the creation of a clandestine or defensible retreat, haven, or bug out location (BOL) in addition to the stockpiling of non-perishable food, water, water-purification equipment, clothing, seed, firewood, defensive or hunting weapons, ammunition, agricultural equipment, and medical supplies. Some survivalists do not make such extensive preparations, and simply incorporate a "Be Prepared" outlook into their everyday life.