Ask your doctor for a prescription, explain it is for wilderness/foreign travel/emergency use only when there is no access to medical care, and not for routine "emergencies" at home.

Cipro may be an appropriate choice for your physician to prescribe. It has broad coverage over wounds, lower respiratory and urinary tract infections, infectious diarrhea, typhoid, etc.

Please get proper and thorough medical instruction on this, to make sure you know exactly when (and when not) and how to use whatever medicine is prescribed.

(Since I'm a paramedic, I tend to get some trust and leeway with this sort of thing. YMMV.)