Purifying waste water with plant technology
“Growing Clean Water” book by B. C. Wolverton, http://www.wolvertonenvironmental.com, http://www.oceanarks.org, http://www.waterstewards.org;

Gray water recycling
http://www.oasisdesign.net, http://www.zeri.org, http://www.oceanarks.org, http://www.waterrecycle.com.au, http://www.seacology.org, http://www.seaweb.org, http://www.surfrider.org, http://www.waterrecycling.com, http://www.korte-organica.hu, http://www.solaraquatics.com, http://www.livingmachines.com, http://www.psu.edu/dept/cs/aees.htm, http://www.cepp.cc;

Book- “Last Oasis: Facing Water Scarcity by Sandra Postel, http://www.worldwatch.org, http://www.swaphep.virtualactivism.net, http://www.thewaterpage.com;

Rainwater Harvesting
http://www.rainharvesting.co.uk, http://www.rainwaterharvesting.org, http://www.aboutrainwaterharvesting.com, http://www.cgwaindia.com, http://www.dmoz.org,
http://www.ag.arizona.edu/OALS/oals/dru/waterharvesting.html, http://www.sustainable.com.au/rainwater.html, http://www.rainharvesting.co.uk, http://www.forgottenrain.com, http://www.lifewater.ca/rain.htm, http://www.rainwaterharvesting.net, http://www.portlandrainbarrels.com, http://www.raincentre.org, http://www.users.easystreet.com/ersson/rainwatr.htm;

Fog Water Collecting
http://www.fogquest.org, http://www.marienberg.cl;

book- Water for every Farm by P. Yeomans (www.acresusa.com);