Water Cone
Here's an common sense innovation that uses condensation to purify water.
Step 1 - Poor water into tray.
Step 2 - Place lid and whole water cone in the sun for water condensation to begin.
Step 3 - Collect purified water by inverting the cone lid and pouring water out. The point of the cone has a screw cap that you remove to pour out water.
Simple and ingenius!
Photo from www.watercone.com