What household items to use
Hi there. Mix together one-half cup of Apple Cider Vinegar, 1 teaspoon of Molasses, one-quarter cup of sugar, and 1 cup of water. Mix until sugar is dissolved. Pour this solution in small containers and, if being used outside, hang them in trees. If being used indoors, place them around where you see flies.
It's not a DIY but I use those bags that you fill with water and hang outside. They stink like crazy, but they really work.
The version for stinging insects works exceptionally well too.