1. A mason jar and put in about 1 tablespoon of apple cider vinegar and a piece of fruit.
2. Make a funnel out of paper and leave a fruit fly sized hole in the bottom of the funnel.
3. Put the funnel in the jar and seal with tape.
The fruit flies will go into the funnel, but not out. Any fruit will work in the jar as long as you have removed the fruit from your kitchen counter (If there is fruit on the counter, they will go to that first).
4. After you catch the fruit flies, put the jar in your freezer for a few minutes to kill them and then you can take it out and use it again.
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