http://www.ehow.com/about_4829306_new-methods-water-purification.html

http://en.wikipedia.org/wiki/Water_purification

http://adventure.howstuffworks.com/survival/wilderness/how-to-find-water4.htm

http://www.drinking-water.org/html/en/Treatment/Human-and-Animal-Waste.html

http://www1.voanews.com/english/news/a-13-2005-03-17-voa34-67381152.html

http://www.pacinst.org/reports/water_related_deaths/water_related_deaths_report.pdf

http://en.wikipedia.org/wiki/Waterborne_diseases