Fruit Flies....goodbye

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Any small container with a teaspoon of cider vinegar, 2 tablespoons of water, and a drop of two of dish soap will attract and drown fruit flies. To kill off the rest of the population, try pouring a cup or two of warm/hot vinegar (can be diluted with half water) down your kitchen and bathroom drains.
Fruity smelling dish washing liquids (lemon, etc.) will attract fruit flies.

OR

Fill a fine misting spray bottle with rubbing alcohol.[1] Spray on the hovering fruit flies. They'll fall to the floor and you can sweep them up and dispose of them. This isn't an effective insecticide––you'll need to actively remove the flies by hand but it beats toxic sprays!