Jimbo, I knew I would not be disappointed.  All these years wandering and wondering and the answer was this simple.  It also explains an experience early in my portage days.  I came upon such an ancient jug on a distant lake between such no-name lakes amidst a pile of what I now presume were stone pine gnawings.  I opened the cork with an effervesant pop and took a draw, then immediately spat it out.  My uniformed assumption was that this rancid liquid I'd found was an aged pee jug of some old voyager too lazy to leave his canvas in the dark of night.  Regaining consciousness, a short while later, I noted several bite marks about my appendages - yet not another living being around for miles.  I now understand what I encountered was this fabled pine liquor.  If you ever cross that lake between the no-name lakes, you may just find that jug sitting there. Temptingly. 

While I appreciate your invitation to join the expeditionary search this paddling season.....I've seen your dental work.  :o

pd