Slit the beans lengthwise down the middle. If needed, cut beans in half to fit into the bottle.
Place beans in bottle. Using a funnel, pour the vodka on top of the beans until fully submerged. Close the bottle and feel free to give it a couple of good shakes.
Store the mixture in a dark place out of sunlight for a minimum of eight weeks.
Note: You can make a bigger batch. Remember to use 6 vanilla beans per every 8 ounces of vodka.
Notes
As you use the vanilla extract, you can refill with more vodka each time. Shake it before and after each use.