I’m sorry, I don’t have much in the way of advice. But you should look into “stealth camping”. From what I’ve seen on youtube and reddit, with the right resources you can set up just about anywhere. Like someone else said, in most public areas you can find a nook, or you can use a car if necessary.
Also, make sure you know what temperatures your meds should be stored at.
Best of luck to you friend, and may the gods’ blessings be overhead.
All sounds very easy for affluent, able bodied, neurotypical people.