I haven't heard this issue as much lately, but a few years ago we were told that plastic water bottles were ruining the planet. And if that was true then, then it's still true now. So here's an ad idea to communicate this idea, glomming onto the new hit movie The Secret Life of Pets:
We see the dog character, and he's being walked outside, and he keeps running into empty water bottle after empty water bottle discarded on the sidewalk and throughout the park. So when he gets home, he walks into the bathroom, sees more empty water bottles in the trash can there, and he says to the camera: "Plastic water bottles are bad for the environment. That's why I only drink toilet." And then he takes a drink of water from the toilet.