I have the water and food, but what medical supplies in particular? I have the basics covered. Maybe I just need to buy a serious kit.
Have you taken a first aid or first responder class? I would highly recommend the Tactical First Aid class with 4G Tactical! Awesome realistic training. I built my medic/trauma kit(s) after I took this class.....and for very cheap too...you don't need expensive junk. A lot of times, tampons and duct tape work the best, especially for GSW.
http://www.4gtactical.com/#!classes/cdk6