We are having a fruit fly infestation in our house right now. Some good friends of ours gave us a solution..... and we scored! Lots and lots of fruit flies.
The secret is Apple Cider Vinegar in a dish with Saran Wrap on top. Plus a few holes punched in the Saran Wrap. The bugs are attracted to the vinegar and crawl into the Saran Wrap to be close to it. They then find themselves trapped by the Saran Wrap and cannot get out. Death is then inevitable. Done. No more infestation.