I can't speak for early 14th century Scotland in particular, other than to note that we have no evidence for the consumption of distilled liquors at that time and place, but I can say a bit about medieval wound treatment.

Obviously germ theory was completely unknown, as it would be until the late 19th century. People didn't know why wounds became infected. But they do seem to have understood that certain substances could be used to prevent infection, even if they had no grasp of the biological processes involved.

In 1403, the 16-year-old Prince of Wales, the future Henry V, was shot in the face while leading troops at the Battle of Shrewsbury. The arrow entered through the cheek, beside the nose, and penetrated to a depth of some five or six inches before becoming lodged in the skull. Physicians were initially able to remove the shaft of the arrow, but not the head, which was stuck fast; attempts to remove it resulted in excruciating pain. The royal physician, John Bradmore, developed a surprisingly effective treatment. First, the wound was treated with honey and wine (and the patient with opium!), both of which have antibacterial properties. Second, he designed and had built a set of tools, including very small tongs and a sort of screw, which he used to first loosen the arrowhead and then remove it. The wound was treated with white wine and herbal compounds for the next several weeks until it closed, and the future king lived another 19 years in reasonably good health, albeit with a gnarly scar.

Edit: I reworked my description of Henry's treatment after consulting my sources. This is why you don't write from memory!