When I was in 7th grade, I was tricked into joining the cadets. The one thing I remember learning in there was that we could distill our own urine into potable drinking water, if survival was at stake.
Here's a method I found on line, describing how to do so..
Another method for distilling urine into potable water, however, would not require the use of a campfire, distillation tank or lengths of tubing. A more passive source of potable water involves the condensation of water and solar heating. First, a large hole must be dug into the ground to expose as much moisture-laden soil as possible. A clean receptacle should be placed in the center of the hole. The next step may sound completely distasteful, but it is essential when distilling urine for survival. All future urine should be deposited in the freshly-excavated area around the receptacle, but not in it.
During evening hours, a large plastic sheet or tarp should be placed over the excavated site. The corners of the sheet can be secured with large rocks, The sheet itself should not touch the sides of the hole, but remain suspended several inches above it. The area of the sheet directly over the receptacle should be held down with a rock or can to form a focal point for condensation and distillation. Some water should condense overnight and be drawn into the receptacle.
During the heat of the day, solar rays should begin distilling urine from the ground and the water vapor will collect on the plastic sheet. Because the solid minerals and other contaminants usually found in urine are too heavy to evaporate, the trapped water vapor should eventually condense on the plastic sheet and drip into the receptacle as potable water. Distilling urine may not be a person's first choice for creating drinking water, but it can be done with minimal supplies if survival is truly at stake.
Another thing my husband & I came across is air2water, very interesting gig.
It's like having one of those arrowhead stands without the bottle. The filtering system is very high quality, no chlorine in the water, etc..it employs the reverse osmosis technique, and then some.
Here's a link,
http://www.air2water.net/products.html