This may have been said, I'm not sure. But maybe take a medical class and learn to use certain medical supplies. Stocking up is good, but only goes so far if you don't know how to put it to use.
I personally wouldn't put too much equity into advanced medical supplies (think surgical type stuff). Basic first aid like stitching and controlling bleeding and learn to control and treat infections. I feel it's a bit pointless to stock up on stuff for surgical procedures. Without proper training, like ya know...med school it's not very helpful and may just make someone worse off in a bad situation.
Agreed! You can spend money on crap you don't understand how to use, or you can take a class or get advanced training, then build your kit. My main point all along is that you can build a very quality and highly useful kit out of very cheap, easily available items.