Instructables

Step 4: Wine Bottle Trap

Picture of Wine Bottle Trap
This one is just a wine bottle with wine left in the bottom.
 
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credilya2 years ago
I found that hard cider works well too. Might be useful with a 6-pack providing more bottles that are smaller and to maneuver.
Ha!  I also use a wine bottle which works well and is easy to clean.  I just put a bit of juice and a couple drops of detergent inside.  The gnats/flies go down to the juice to drink and drown.  I keep it near the kitchen sink where most of the fly-attracting action goes down.