I mix some cider vinegar, some fruit juice or cider, and a drop of dish soap. I put that in a small jar. I get some plastic film and make a small hole in the m

I mix some cider vinegar, some fruit juice or cider, and a drop of dish soap. I put that in a small jar. I get some plastic film and make a small hole in the middle of the plastic about the size of a pea. I place the plastic on the jar and secure with a rubber band. Place that on the kitchen counter near where the flies congregate. They will follow the scent down the hole where they will be mostly trapped and if they touch the liquid, they will sink and drown as the soap removed the surface tension.