The finished solar still looks something like this.
ILLUSTRATION: D.S. HALACY
For the bad water trough, drill a hole in the very center of the angle iron to receive the center 1/4-inch copper drain tube.
Diagram shows solar still parts and assembly method.
Cut the 1-by-4 redwood side pieces to the proper length. Drill a 1/8-inch hole as a guide, and then drill three 5/8inch holes and one 3/4-inch hole.
Slip the towel loop onto the support tubes inside the box.