I have long been a fan of the Economist. The writing is excellent, well thought-out, and often reports on stories ignored or buried by other news sources here in the U.S.
On Friday, the Economist published an article on water scarcity. The article provides an expansive overview of the problem. While the breadth of the article understandably limits the depth with which it covers various issues, the article is an excellent introduction for anyone who wants to learn about water scarcity.
I highly recommend you check it out.