One of my feral kitties seems to be a little sick. She'll wheeze a few times, then sneeze and then be fine, but one of her eyes is also running. She's not friendly enough that I could just grab her and take her to the vet.

Fortunately, her appetite seems to be just peachy (she is not one to pass up food!!) and besides the newly running eye, the respiratory symptoms don't seem to be getting worse. The wheezing/sneezing has been happening off and on for about a week. The other female doesn't seem to be catching anything either, though I haven't seen the male lately (but he's pretty elusive anyway).

Should I just keep an eye on her for now? Any sort of over-the-counter anything I could sneak into their food?