I am a former Red Cross Instructor, SCUBA Instructor and a certified Herbalist so I am a bit OCD when it comes to supplies of all types, but especially first aid and medicines. I have found that there are online deals on first aid supplies and I am not too proud to raid the shelves at the local dollar store for things such as instant ice packs, nausea and diarrhea medicines, OTC pain meds, etc. I found a suture kit on Amazon, the list goes on and on. It depends on what you are preparing for, I think. Natural disasters, such as hurricanes or snow storms, that will hopefully be short lived would require one type kit which would enable you to handle accidents and injuries just in case EMS can’t get to you, or you to them type stuff. Long term SHTF type scenarios would require a much deeper kit. There are several great prep minded first aid books out there, that would help anyone make the decision as to what they would need based on their concerns. As for antibiotics, I had lots of procrastinated, minor dental work performed last year and the week before my appointment, I called and told him that I thought I had an infection and wanted to get it cleared up before my appointment. Amoxicillin, no problem. I do not care for lying, but I would care less for a family member to die of an infection. We also have hundreds of garlic tablets and we grow garlic, as well.
Just sit down and brainstorm possibilities and prepare for them as you can. Also, you can find medicinal herb seeds on EBay really inexpensively and there are free books on Amazon for the medicinal uses of herbs.