Boiling Water with Just a Knife: NW Primate This sweet video demonstrates how to boil water with only a Tracker knife- from making the bow drill set to making a bark water container. He demonstrates rock boiling as well as boiling directly on the fire with the bark container.
Two Litre Water Filter from Natural Items; Survival on the SKinney He demontrates a water filter using charcoal, sand, grass and rocks.
How to Fill Your Canteen from a Tree: Sigma 3 Survival School Great video on how to tap a tree for sap water with a knife. This is why I carry a spile in my go-bag. but a great technique if you don’t have one. I appreciate their care for the tree as well.
Rock Boiling Water; Native Survival A good step by step of boiling water for purification.
This is a link to my Pinterest page that has images of water collection and purification.