Sprinkle grass clippings or leaves on the side of the hole. Use rocks or sticks to hold the plastic wrap in place. Place a marble-sized stone on top of the plastic. It should be heavy enough to create a point where the condensation can collect and drip into the cup. Now let the sun do its work.
Humans develop survival skills for different environments.
Choose one of these people and write a story about survival from that person's perspective. Read the story to your class. Any sailor, backpacker, or person who spends time outdoors will attest to the importance of knowing how to tie different kinds of knots. Find a book on knots. Get a meter of thin and thick rope for each person in the group.