Re: Epi pen
It's by prescription, and your insurance covers it. Ask your family doctor for a prescription, I've been getting mine for the last 10 years (and none of my kids have allergies).
Re: Vet wrap
It's really thin, unlike the regular ACE bandage, and it's self-adhering. Again, I don't think it would get you much support unless you wrapped it really tight, but then there's the issue of cutting off blood flow.
Re: Duct tape ankle
The duct tape would be taped the same as regular athletic tape for ankles. It's a bit different than tensor bandage because it gives more support and does not stretch. So you can't just do a figure-8 around the ankle, that would cut off blood supply and wouldn't give you great mobility or support. There are videos on ankle wrapping, but basically even if you do three strips of stirrups and secure at the top, this is gonna give you support.
I sprained my ankle on a solo last year, taped it and Advil'd (about 800mg and some Tylenol) - took the 2700m portage out of the park. It was doable... I was actually worried about the logistics of getting out of the park. Taking off the tape is a bit of a pain because of leg hair though (and I have the Gorilla duct tape - sticky!) The heartburn from the Advil was also unpleasant for the next couple of days.
Re: Tourniquet
These are for extreme cases - eg. if a limb has been traumatically amputated. Even for an arterial bleeder (i.e. a squirter), pressure should make the bleeding stop (15-30 minutes of pressure on the wound, directly to the artery) - and then just careful with movement or it will squirt again. But if it keeps bleeding heavily, (and you're worried about the person bleeding out - i.e. 1000+mL of blood) then tourniquet. i.e. you're in a literal bloodbath at this point. A belt is best - you need something thick to stop blood flow to the limb. Paracord would be too thin, and a glove would definitely not give enough pressure. Belt. And hopefully the chopper is on the way, or everyone is in deep doodoo (without bloodflow the leg will start to die off).
I think the issue of the traumatic cuts is the reason some people dislike axes so much (a cut to the groin could kill as you wouldn't be able to tourniquet above the bleeder). But there's risk with driving up the 400 as well...
Cheers
M