I named my first book The End of Abundance to signal to readers that changing water scarcity (in quality or quantity) requires new ways of managing water. (That's the same plot in my second book, Living with Water Scarcity, which is free to download :)
Now the World Bank has put out a book (Uncharted Waters) and series of comic strips (see below) on this issue. I recommend this to anyone seeking an easy summary or easier-to-share version of the issues, why they matter, and how to address them.
Shocks in the City