What we need is basically:
200 ml water
50 grams of brown sugar,
1 gram of yeast (yeast bread, found in any supermarket) and a 2-liter plastic bottle. [...]
One. Cut the plastic bottle (PET type) in half. Storing the neck portion:
2nd. Mix brown sugar with hot water. Let cool. When cold, pour in the bottom half of the bottle.
3rd. Add the yeast. No need to mix. It creates carbon dioxide.
4th. Place the funnel part, upside down, into the other half of the bottle.
5th. Wrap the bottle with something black, minus the top, and put in some corner of your house.
In two weeks you will see the amount of mosquitoes and mosquitoes who died inside the bottle.