In a world where nearly 5,000 children die every day from diseases caused by unclean water, about one in nine human beings don’t have enough clean water to drink, and roughly 2.5 billion lack adequate sanitation, more help is needed. This list will be updated periodically, so check back soon.
Angie’s List: Information on Outdoor Water Conservation
aquaNOW.info: The World’s Water Data Engine
AquaFed: The International Federation of Private Water Operators
Asia Society > Policy > Water and Food Security
A Tax on Bottled Water: Cambridge Law’s Jorge Viñuales at TEDx Zurich (video)
Big Picture Agriculture > 35 Conservation Techniques for Agriculture, Farming and Gardening
“Blue Gold: The World Water Wars” (documentary film)
The Butterfly Effect (coalition of international water and sanitation NGOs)
The California Drought (Pacific Institute)
Ceres: Feeding Ourselves Thirsty: How the Food Sector Is Managing Global Water Risks (full report)
Ceres: Hydraulic Fracturing & Water Stress: Water Demand by the Numbers
Ceres: Mobilising Business Leadership or a Sustainable World (Issues: Water Issues)
Chinadialogue.net > Topics > Water
Circle of Blue: Information About the World’s Resource Crises
Columbia Water Center (Earth Institute / Columbia University)
Eradicating Ecocide Environmental Initiative
Environmental Performance Index (Yale University)
European Commission > Environment >Water
Global Water Partnership > Videos
Grace Communications Foundation > Water Program
Green Growth Knowledge Platform
The Guardian: Access to clean water and sanitation around the world – mapped
FAN: Freshwater Action Network
Food and Agriculture Organization of the UN: FAO Water
FAO Water > Aquastat global water statistics (brochure)
ImproveNet: Water Conservation at Home
Institute of Public & Environmental Affairs (IPE) (China)
International Association for Water Law (AIDA)
International Association of Hydrogeologists
International Atomic Energy Association (IAEA) Topics in Focus > Water
International Desalination Association (IDA)
International Water Law Project (IWLP) (includes blog)
International Water Management Institute (IWMA)
International Water Resources Association (IWRA)
LLoyd’s 360 Risk Insight: Global Water Scarcity – Risks and Challenges for Business
National Resources Defense Council > Water (NRDC: U.S.)
The Nature Conservancy > Global Water Program
Society for Freshwater Science
Stockholm International Water Institute (SIWI) (and SIWI Blog)
Strategic Foresight Group > Publications
“Tapped” (documentary film about the bottled water industry)
The Right to Water and Sanitation Information Portal
The Solutions Project (U.S. state plans for 100% clean, renewable energy)
TheThirdPole.net: Understanding Asia’s Water Crisis
UN Environment Programme > Vital Water Graphics (2008)
UN Habitat > Water and Sanitation News
UNHCR (High Commission for Refugees): Water, Sanitation & Hygiene (WASH)
UN Human Rights (OHCHR) > The Right to Water and Sanitation Toolkit
UN Water > A Post-2015 Global Goal for Water: Key Findings and Recommendations
UN ‘Water for Life’ Decade, 2005 – 2015
UN Water >World Water Day 2014 Water & Energy
UN World Water Development Report 2014, Water and Energy (download on UNESCO site)
UNECE Water Convention (Treaty)
UNICEF Water, Sanitation and Hygiene (WASH) Newsline
Water Deeply (News Deeply site)
Water Integrity Global Outlook 2016 (WIGO)
WaterLex Legal Database on the Human Right to Water and Sanitation
WaterLex Toolkit: Integrating the Human Right to Water and Sanitation in Development Practice
Water Supply & Sanitation Collaborative Council: Media
Water Use It Wisely > 100+ Ways to Conserve Water
WhollyH20.org: Mainstreaming Localized Water (Re)use (California)
The World Bank > Open Knowledge Repository (OKR)
The World Bank > High and Dry: Climate Change, Water and the Economy
World Health Organisation (WHO): Health Topics: Water
WHO Programmes: Water Sanitation Health
World Meteorological Organization>Media Centre
World Resources Institute > Water
World Wide Fund for Nature (WWF) Conservation News: Rivers, Lakes & Wetlands
2030 Water Resources Group: Water for Growth, People and Environment
*(Note: The international public-interest development organization WaterLex employs me as its head of communications. )
At the Waterline 
Another link for your list: http://www.wateraid.org – fantastic charity working for clean water, sanitation and hygiene.