The "paper cone of death" fruit fly trap is one way to kill those annoying little pests. But, the other day, when I was having trouble fitting a paper cone into my glass, I discovered an alternate solution that's just as effective!
The basic principle is the same: wine, fruit juice or apple cider vinegar lures in the flies. A few dots of dishwashing liquid on top helps prevent their escape and, just to be sure, the cone or, in this case, a piece of clear plastic wrap dotted with three or four fruit fly-sized holes, is a physical barrier to their exit. As they used to say about a certain kind of roach trap, fruit flies check in but they don't check out.
I used Glad Press and Seal, but you can use any kind of plastic wrap. A rubber band or hair elastic can be used to ensure a tight seal. Don't make your holes too big; a toothpick makes one that is just the right size.
(Image: Abigail Stone)