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I just started browsing through Where (When?) There is No Doctor, and I thought I remembered it saying something about there are a few different basic kinds of antibiotics, some are good for some things and others for other things, etc.
Right now I'm still at the point where I know just enough to be dangerous, but I suppose the way I look at it is you should also be reading some books like I am and/or taking some classes and/or learning some basic first aid and medicine, along with just having the supplies.
I just realized maybe you do have the knowledge already and just asking how to get penicillin, but I suppose it's still good advice for others reading.
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