Filtering dirty water- but a coffee filter or a paper towel in a cone line shape and stick in water bottle. Pour dirty water through the paper and watch the clean water pour into the bottle and the dirty stay in the paper.
Pinned again onto crafts with thoughts of SHARK! [Our littles are fascinated by all things SHARK at the moment; would be cute to make for Shark Week/Sharknado! (Adapted from original purpose of Jonah/Whale lesson pinned onto Kid Stuff!