4 cups Vodka (Rum or Bourbon)
I split the vanilla beans but leave the ends intact slightly and drop them into the jar.
I then pore the vodka all the way to the top and seal the lid. I store it in a dry, cool, dark area (pantry) for about 6 to 8 weeks shaking it about once a week. The longer you leave it the stronger it gets. I then use the Nut Milk Bag and strain the extract before I transfer it to my working small bottle.
I have a bottle going at all times just refilling both my large and small bottles when they get low.