Does anyone have a recipe for or know of any natural mixture that can be used as an attractant to draw houseflies and/or fruit flies into a trap? We are inundated with flies during the warmer months and also have fruit trees in the yard. I have tried sugar water with applecider vinegar; water, applesauce, and honey and several other mixtures to no avail. The traps sold in farming supply stores are pretty expensive so I have made some from 2lt. Soda bottles but cannot find a good mixture for the attractant. I would appreciate any/all suggestions!