If the berries are frozen - defrost them in the vodka.
Use a clean glass jar with tight-fitting lid.
Fill 1/2 - 2/3 of the jar with blueberries.
Fill up with clear, unflavoured vodka - 40% alcohol content (80 proof).
Steep for at least 3 months in a dark place at room temperature, 18-20°C (64-68°F).
Shake lightly and taste it from time to time.
Strain and filter your infusion into a clean glass bottle or jar with tight-fitting lid.
You can serve your blueberry schnapps after it has settled for a couple of days. It has a nice, fruity taste.
Or you can store (age) it for 4-6 months or even longer in a dark place at room temperature before serving.
The flavours will change rather much during storage. For the better I think. But it's a matter of taste. Some prefer the fruity taste - others prefer their blueberry schnapps after some storage.
Note: If for some reason you are not satisfied with your infusion, there are ways to adjust both taste and flavours - click here to see how.
Serve your blueberry schnapps at room temperature in suitable glasses. And remember to keep your schnapps bottle tightly closed and in a dark place before and between servings.