content: Some of the Cleanest water on Earth (same stuff in the Okefenokee swamp).  The little bastard organisms that give humans a rough time can't grow in the stuff due to the alkalinity (on the base side), and sailing ships used to fill their water barrels with the stuff because it'd not only last longer, but if you diluted normal water with it you could make it safe again. Yup, I've drunk the stuff out of Both the Okefenokee and Blackwater river in FL on overnight kayak trips.