Bring the water to a boil and add the sugar, then reduce the heat and let it simmer without stirring.
Let the mixture simmer for about 15-20 minutes until it thickens into a syrup.
Add the bunch of fresh mint and continue simmering for another 15 minutes.
Add the white wine vinegar and stir a few times.
Remove the pot from the heat and let the syrup cool with the mint in it.
Once the syrup has cooled, remove the mint and strain the syrup into a bottle.