Sorry, my little winged friends. No one ever said life was fair.
Drawn by the scent of the vinegar, the fruit flies get caught in the bubbles and die. When the bubbles disappear, dump some of it out and fill it with a little more water. Keep changing out your jar periodically until they’re all gone — It’ll generally take between 24 and 48 hours to get rid of all of them.
You’ll probably be amazed by how many fruit flies you had in the house. It’s disgusting and yet strangely satisfying to count how many fill your jar at the end of the day. And it’s a HUGE relief to eat and drink in peace again, without worrying that a fruit fly is going to ruin your meal.