Clean out your bottles and lids, and dry them completely.
Split your vanilla beans in half down the middle so that the beans are exposed. You don't need to cut them through, just cut through one side to expose the seeds.
Trim the beans as need to ensure they will fit inside the bottles.
Place the vanilla beans in the bottle.
Using a funnel, or carefully pour the vodka into the bottle over the top of the beans until they are fully submerged. Leave a little space at the top of the bottle so you have room to shake the bottle over time.
Seal the bottle with a lid, and add a label if using.
Store the vanilla in a cool place, away from sun exposure. Shake the bottle about once every week.
Use vanilla after 3 months, 6 months to 1 year is even better! (Repeat with additional beans, vodka, and bottles as desired.)