You can make one really easily by putting warm apple cider vinegar in bottles, fill about a quarter of the way up and put in a drop of soap, but don't shake. The vinegar attracts the flies, they land to get a drink, and the soap has broken the surface tension and they fall in and drown. Add a few drops of a gourmet cooking wine (mine had blackberies, I think) and they like it even more. I literally had bottles with inches of sludge composed of dead flies and vinegar. they didn't come back for a few years until a new platoon with no knowledge of the massacre stowed away in a bag of apples. The war is almost over again.
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