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History has is that canteens date back as far as 60,000 years ago; primitive canteens were made from a variety of materials including: hollowed out gourds, ostrich eggshells and animal skin. For hikers, campers, soldiers and field workers canteens were (and still are) a must have for surviving the elements. While it’s believed that humans can live up to 3-8 days without water (depending on physical fitness levels and surrounding environment) the story that follows just might have you rethinking conventional wisdom.