red wine vineger worked the best for me as bait. If you have them at this time of year though they must be living and reproducing somewhere in the house. There is no way they are surviving outside and like the previous poster said they have short life spans.
Your best solutoin is to find whatever it is they are eating and get rid of that. Otherwise any other solutoin will only limit their numbers and not get rid of the problem. Apparently they can reproduce in old trains if there is a buildup, the best way to check for that is to plug the drain overnight and then pull off the cover to see if there are any in there.
Otherwise I would try not leaving any garbage around ever, and also checking any household plants you have. Check behind the fridge or other crevaces for a piece of fruit that might have fallen there.
I had very similar problems about 4 months ago. Ended up checking the garbage bin beneath the bag... and sure enough one old piece of fruit that was producing hundreds of fruit flies. I think the issue is that the flies move inside once it starts to get cold, then they stay there if you don't get rid of their source.
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