I would advocate that people avoid carrying any antibiotics. Most of them are at least mildly toxic and allergies are not uncommon. Selection of the right antibiotic for a condition is not a simple choice and dosing is problematic.

Most people who carry them have no idea what the right dose is, and given the right dose most of them don't carry enough to complete a proper course of treatment. Half a dose or half the proper time is a grand way to make sure any infection becomes resistant to the antibiotic you half-use.

A stock of antibiotics can make sense if you are spending a long time in a very remote location. They can save the day if you're 500 miles and two weeks from anywhere. But 99% of the people don't qualify and are not far enough out long enough for antibiotics to be any benefit.

Given that a PSK is going to be limited to a short-time, typically two to five days, but always less than ten days, there is no need for antibiotics.