Apple Cider Vinegar
½ tsp Dish soap
Toothpick or knife
Fill your cup with an inch of apple cider vinegar then add in ½ teaspoon of dish soap. Stir it up.
Cover the top of the cup with plastic wrap and wrap a rubberband around the edge so it stays.
Take a toothpick or knife and make small holes all over the top.
Place next to fruit on the counter. Watch them fly in and die!