I read threads in this section and I understand we all want sexy gear but if you practice the basics, it will pay dividends in the future.
Here is a list of stuff for your prep plan:
Start taking BP and lung/heart sounds on your patients/family/bug out group. You need to determine what normal is before SHTF..... If you don't know what normal is, it's gonna be hard as f to determine what's wrong when hell breaks lose.
Practice the the basics to identify problems before they rapidly get out of control...(be a lazy medic)
It sounds dumb to tell people to drink water but it's easier to have them stay hydrated, then end up a patient. Bleeders, environmental or other med/trauma only gets worse with dehydration.
Same goes with OTC meds... If the have allergies or a cold, give them pills and don't wait until they feel like shit to play medic. Most stuff doesn't get better with time.
I will try and post some more basics/tips when I have time. Overall, playing medic isn't sexy but preventative medicine will save you a lot of headache and sleep if you stay on top of the situation.