Step 1: You Will Need...
Peanut butter (or another oil based bait that will work on your particular vermin)
Step 2: Preperation
2. Half fill the Pet bottle with water and screw the lid on. Smear the bottle with peanut butter or your other bait.
3. Put the bottle in the bucket. It should float on the water.
4. Select the area where your vermin gather and place the bucket. Put 1 plank over the center of the top of the bucket and use the other to make a ramp.
Step 3: Wait
Leave th trap overnight and hopefully catch that critter. You may need to run your operation a few nights till the critters get use to the new item in the area.
Check it every day and remove any captured animals. Bear in mind they will drown in the water as they will get tired of swimming.