You could do the same thing with an empty wine bottle. They go in after the wine and can't get out.
I had very limited luck with the vinegar bowl. I put this in my composter to cut down on the clouds of ff's. About 10-15 went in and drowned. I had to just accept them for the rest of the summer.
You should also pour boiling water down the sink drain, as they feed off the gunk in the drains.
Also, keep as may fruits and vegies in the fridge as possible during an infestation. They lay their eggs in the f&v skins and then either you eat them (MMMMMM, protein) or they hatch. Gross either way.
They are so hard to get rid of, becaue they (in the absence of food) can live off of fumes in the air. (cooking food etc)
And forget about trying to smack them with your hands. You'll just look like a fool running around smacking at the air. They're too quick and you'll just end up clapping your hands together and catching air. LOl
BTDT!~