"The more widely known antiseptics - alcohol, tincture of iodine, or the mercurial preparations - injure the tissues and should not be placed directly in an open wound." - Medicine for Mountaineering, 3rd edition., p. 96. Thorough irrigation and rinsing is recommended for open wounds. If you are giving injections, either one can be used to prep the site.

I usually carry a tiny bottle of hand sanitizer, which I can use directly as fuel in an alcohol stove or as a fire starter, in addition to its stated use.