To the extent that one exists, the public image of a prepper is of someone who's getting ready for the collapse of society, at which point money and electric grids, along with all the things that depend on them, will become unavailable. Preppers are ready to purify water to drink, hunt and butcher for meals, and scare off anyone who tries to get a piece of their post-apocalyptic bliss, possibly via gunfire. There may be bunkers involved.
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.
I'm not quite crazy enough to say that epinephrine will help you survive the inevitable zombie apocalypse (you can go here for that). I'm just suggesting in a roundabout way that if you happened to be in a situation where something was trying to eat you, the increased heart rate and blood flow to your muscles brought on by a well-timed dose might just save your life.

Insist on yourself; never imitate. Your own gift you can present every moment with the cumulative force of a whole life's cultivation; but of the adopted talent of another, you have only an extemporaneous, half possession. That which each can do best, none but his Maker can teach him. No man yet knows what it is, nor can, till that person has exhibited it. Where is the master who could have taught Shakspeare? Where is the master who could have instructed Franklin, or Washington, or Bacon, or Newton? Every great man is a unique. The Scipionism of Scipio is precisely that part he could not borrow. Shakspeare will never be made by the study of Shakspeare. Do that which is assigned you, and you cannot hope too much or dare too much. There is at this moment for you an utterance brave and grand as that of the colossal chisel of Phidias, or trowel of the Egyptians, or the pen of Moses, or Dante, but different from all these. Not possibly will the soul all rich, all eloquent, with thousand-cloven tongue, deign to repeat itself; but if you can hear what these patriarchs say, surely you can reply to them in the same pitch of voice; for the ear and the tongue are two organs of one nature. Abide in the simple and noble regions of thy life, obey thy heart, and thou shalt reproduce the Foreworld again.
Jennifer had already taken the necessary precautions the night Hurricane Maria came barreling through the Caribbean. The 46-year-old stay-at-home mom, who lives on two acres of land with her husband and four children atop a mountain in Manati, Puerto Rico, was ready to make use of the filter she’d purchased for sterilizing rainwater in case the taps ran dry. And she didn’t have to worry about food, because her pantry was already stocked with two-and-a-half years’ worth: giant buckets of lentils, flour, and rice; shelves lined with mason jars of fruits and vegetables she had grown and canned herself.
Preparedness refers to a very concrete research-based set of actions that are taken as precautionary measures in the face of potential disasters. These actions can include both physical preparations (such as emergency supplies depots, adapting buildings to survive earthquakes and so on) and trainings for emergency action. Preparedness is an important quality in achieving goals and in avoiding and mitigating negative outcomes. There are different types of preparedness, such as public health preparedness and local emergency preparedness or snow preparedness (i.e.: Snow Preparedness Teams - SPT), but probably the most developed type is "Disaster Preparedness", defined by the UN as involving "forecasting and taking precautionary measures prior to an imminent threat when advance warnings are possible".[1] This includes not only natural disasters, but all kinds of severe damage caused in a relatively short period, including warfare. Preparedness is a major phase of emergency management, and is particularly valued in areas of competition such as sport and military science.