hey Travisli
Here is a quick method... Get a small bowl and fill it about 1/2 full with red wine or red wine vinegar (apple cider vinegar, juice, rotten fruit and water will all work too just not as fast). Cover the bowl with cling wrap very tightly. Then poke several small holes in the top with a pencil. They need to be big enough that the flys can get in. Make sure that the edges of the holes are turned in towards the bowl. (the hole should feel smooth). Then just set the bowl on the counter and it should fill up overnight. The flies go in but they can't get out and then they get too close to the wine and drown.
Some wine in the bottom of a wine bottle will work too if it has a pretty long neck.
Fly drowning!
Good luck
Heather