For the blueberry liqueur, carefully sort the blueberries, rinse with cold water and drain well. Put the berries in a large glass and pour the liquor over them. Close tightly and let the mixture infuse for about 6 weeks in a sunny place, shaking the jar frequently during this time.
Bring 250 ml of water to a boil and dissolve the sugar in it. Add the sugar water to the mixture. Pour the blueberry brandy into well-cleaned bottles, distribute the berries evenly among the bottles. Close airtight and store in the dark.