I hate to be a buzzkill here but, at least as far as I see, epipens require a prescription. Prescribers usually do so for the patient who needs it or a caregiver (parent) of such. You MAY be able to persuade a provider to give you a script for one for some unknown stranger and situation but if you came to me, I wouldn’t do so; when prescribed appropriately, the patient or caregiver knows what to look for in the individual who needs one. If I wrote such a script and someone, with the best of intentions, misused it and the person was harmed, I’d fully expect my actions to be looked into - and my license at risk. If I had written a script for someone who had a legitimate risk of anaphylaxis and THEY chose to use it on a bystander, that’s on them.
Plus, if it needs a script, we’ve circled back to the insurance fraud potential. If you choose to find a way to carry an epipen you don’t personally need, I’d suggest paying for it out of pocket. And they aren’t cheap. And they expire.