How can I get rid of fruit flies?

set a fly trap - a little cider vinegar in water in a shallow bowl with a few drops of dish liquid soap

Fruit fly traps. Also, try to buy fruit that isn't already carrying them. I usually treat/clean my fruit before placing it in the fridge or bowl, as well. Haven't had any fruit fly issues in years now :)

Here is my DIY fruit fly trap https://www.homeroad.net/2015/10/a-fruit-fly-trap-that-works.html

Use a glass with 1/2" cider vinegar or red wine in the bottom. Cover with plastic wrap, then punch round holes in the wrap. It may take a week or more to catch all of them and you may want more than one trap in different locations. Leave the traps out until fall.

Here's a tutorial I wrote that might help you - https://chascrazycreations.com/diy-bug-repellents-traps/

Fill a microwave-safe bowl with apple cider vinegar and a few drops of dish soap. Microwave the bowl so the mixture becomes even more aromatic. Leave the bowl out uncovered as fruit fly bait. The soap will reduce the surface tension, causing any fruit fly that lands on the surface to drown. Now, you might have drain flies...if that is what you have try this: Boil some water on the stove and pour down your drain several times a day for about a week or Mix 1/2 cup salt, 1/2 cup baking soda and 1 cup of vinegar and then pour the mixture down the drain, leaving it overnight. In the morning, pour boiling hot water down the drain.

If a drain fly infestation lasts longer than 20 days despite different approaches to get rid of them, then it’s time to call a professional exterminator.

Fill a microwave-safe bowl with apple cider vinegar and a few drops of dish soap. Microwave the bowl so the mixture becomes even more aromatic. Leave the bowl out uncovered as fruit fly bait. The soap will reduce the surface tension, causing any fruit fly that lands on the surface to drown. Now, you might have drain flies...if that is what you have try this: Boil some water on the stove and pour down your drain several times a day for about a week or Mix 1/2 cup salt, 1/2 cup baking soda and 1 cup of vinegar and then pour the mixture down the drain, leaving it overnight. In the morning, pour boiling hot water down the drain.

If a drain fly infestation lasts longer than 20 days despite different approaches to get rid of them, then it’s time to call a professional exterminator.

Buy sticky traps.