http://www.allaboutwater.org/water-facts.html
http://www.water.org/waterpartners.aspx?pgID=916
http://en.wikipedia.org/wiki/Drinking_water
http://www.epa.gov/safewater/sdwa/30th/factsheets/pdfs/fs_30ann_waterfacts_web.pdf
http://www.bidness.com/esd/h2ofacts.htm
http://www.cybercity-online.net/health/water.html
http://www.drinktap.org/consumerdnn/
http://www.mayoclinic.com/health/water/NU00283
http://www.cnn.com/HEALTH/library/NU/00283.html
http://www.naturodoc.com/library/nutrition/water.htm
http://www.sciencedaily.com/releases/2007/08/070811225126.htm

For example “In fact, recent studies have shown that 75% of the American population is dehydrated.”