The equipment list here is simple: Mason jar, hammer and nail, cheap beer. Drown those suckers before they ever get going. It's all natural, non-toxic, and all it'll cost you is a little beer.
• See the full instructions: How To: Make the Ultimate, Reusable Fruit Fly Trap at Curbly
Of course, if you're using a clear Mason jar you may want to put it somewhere out of sight in the kitchen. You can also wrap the jar in paper or aluminum foil, or use a non-transparent jar to hide all that drowned fly ickiness.
We have a few more pieces of info and good ideas on getting rid of fruit flies here: