Everyone should visit a wastewater treatment plant at least once in their life. When I was still in the classroom, I took my AP Env Sci students to our on-campus plant. They were amazed. Success!

Like the others, I like the "eating water" concept. It reminds me of a special National Geographic that came out in 2010 that looked at water. It came with a poster that included how much water it takes to produce everyday items: a cheeseburger, pair of jeans, etc.