Rubbing alcohol, methanol, or waterless hand washing gel. Methanol/denatured alcohol can fuel a stove, disinfect splinter forceps, and provide a highly efficient local cleansing. Disinfects as it cleans. Lighter than water, for a given volume. Makes one smell like a brewery, briefly. Not for internal use. Not for use on broken skin. Don't wash up near an open flame. We used to use rubbing alcohol/isopropanol for back rubs and cooling the fevered child, until we decided that inhaling the concentrated vapors was ill-advised: try not to inhale while cleansing. Some sort of alcohol is often a component of wet wipes.

Tequila would suffice in a pinch. I have never used wine for bathing, but would suggest a dry white, crisp and a bit woody. Champagne baths are a popular indulgence in luxury spas, and one should never venture into the wilds without a magnum of Dom.