The Ranger's Digest: Filter and Purifying Water
   Describes how to filter and purify water.
   http://www.therangerdigest.com/Tips___Tricks/Filter_and_Purifying_Water/body_filter_and_purifying_water.htm

Transpiration: How would You Get a Drink from a Tree?
   Explains a technique for obtaining water from a tree.
   http://www.edibleplants.com/month/transpir.htm

Wilderness Manuals - Water Procurement
   Describes how to find, purify and store water. Features illustrations and links to related topics.
   http://www.wildernessmanuals.com/manual_6/chpt_7/2.html