Homemade Mosquito Trap Items needed: 1 cup of water 1/4 cup of brown sugar 1 gram of yeast 2-liter plastic bottle 1. Cut the plastic bottle in half. 2. Mix brown sugar with hot water. Let cool. When cold, pour in the bottom half of the bottle. 3. Add the yeast. No need to mix. It creates carbon dioxide, which attracts mosquitoes. 4. Place the funnel part, upside down, into the other half of the bottle, taping them together if desired. 5. Wrap the bottle with something black, leaving the top uncovered, and place it outside in an area away from your normal gathering area. (Mosquitoes are drawn to the color black or white.) Change the solution every 2 weeks for continuous control. If you can't visualize the finished device, just do a search for "Mosquito traps" This works wonderfully! It took about half an hour for the skeeters to find these, but when they do, you can sit and watch them just kamakazee into the trap. I am going to try this with regular 20 oz pop bottles for camping.