Project Wet, dedicated to water education, offers some great resources to supplement your Wells of Love program curricula activities.
Check out this free download, Discovering Drought. Containing a lesson plan for 3rd through 6th grade, it links to a more extensive activity booklet about drought available inexpensively in their store.
From the lesson plan:
Although drought is a serious topic, it can be presented in a way that empowers your students with knowledge and the opportunity to take action.Also, I recommend visiting Discover Water, Project Wet's interactive website through which students can explore the role water plays in our lives. There are activities that explain the water cycle, watersheds, oceans, fresh water, using water, and more.
A foundation of water knowledge will empower your students, adding context and meaning to their philanthropic actions for the Azawak. Discover Project Wet!