I like to have a separate bottle to pour my finished vanilla into once it’s ready. I pour out half of it and then I fill up the original bottle (with beans) with fresh, new vodka. The beans in there still have “life” left to them so they will continue to make more beautiful vanilla. Eventually you will notice that they are not as potent anymore (you won’t get as dark of vanilla). When that happens you can just add 5 or so new beans to the mix.