Brown sugar (3/4 cup)
Step 1: Step 1
Cut the top quarter of the bottle off with a knife and flip it upside down, back into the remaining 3 quarters of the bottle. Tape is optional for reinforcement purposes.
Step 2: Step 2
Fill the bottle with the brown sugar and water and mix it in.
Step 3: Step 3
Add the yeast and shake gently.
Place near problematic areas and check periodically.