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English: William Waterway Marks (top center) with crew from the award-winning film, "FLOW: For Love Of Water." William is one of a group of water advocates featured in the film.

FLOW was directed by Irena Salina (on William's right); produced by Steven Star (bottom center), and co-produced by Gill Holland and Yvette Tomlinson (on William's left). FLOW won the Grand Jury Award at the Mumbai International Film Festival and the Grand Jury Award for Best Documentary at the United Nations Film Festival.

FLOW launched a Right To Water campaign to add a 31st article to the Universal Declaration Of Human Rights, Article31.org. FLOW was released theatrically by Oscilloscope Labs in September, 2008, and then invited to screen for the UN General Assembly on the 60th anniversary of the signing of the Universal Declaration of Human Rights, where the first 50,000 signatories to Article31 were presented to the President of the General Assembly, Father Miguel D'Escoto Brockmann.

On July 28, 2010 a resolution was presented by Bolivia and co-sponsored by 35 countries, calling on the United Nations General Assembly to recognize the Right To Water. Despite opposition from the US, the UK and their allies, the resolution passed with the support of 122 countries, representing more than 5 billion of the world's population.