Mix 2 cups of pure cain granulated sugar to 2 liters warm water. Use bottle or filtered water so to not have chlorine. Add a little yeast. If you buy a packet then use about 25% of it. Otherwise use about 1/2 a teaspoon.
Set that aside. You'll need it at the last step. It should be frothy by then. If not then it won't take long.
Step 1: Start
This is the easiest bed bug trap.
2 or 3 liter bottle
Roll of Paper Towels
Scissors with a sharp point or include a knife or razor