Re: Prescription medicines for first aid kit
Did I not see Demoral on this thread? What do you do if someone breaks their arm or leg? If I am going to be at least one to three days away from medical treatment, I would want something to help with the pain of a limb breaking. I would have a few pills and at least enough liquid for a few injections.
As far as legality goes, as long as you have something that was prescribed and bought at a pharmacy, proving it's legitimacy should not be a problem in this information age. If you are really worried, just photo the prescriptions and receipts and keep 'em on your smart device and the cloud.
I travel with quite a few prescription drugs all the time. If any LEO wants to know if they are legit, they can call my pharmacists anytime. I don't even bother carrying any documentation on me.
Admittedly, it's also easier being middle aged and having all these drugs than being 25.