Water is like electricity. Most people don’t think about it much until it’s gone. Now, as California and other Western states find themselves heading into a severe and worsening drought, a new interactive map is providing a breathtaking journey that shows where America’s water comes from and ends up. The project is called River Runner. It allows anyone to click on any place where a raindrop would fall in the United States, and then track its path through watersheds, into creeks, rivers, lakes and ultimately the ocean.