Long time coming but I'm finally trying my hand at making vanilla extract!
I made two bottles, one 8oz (about a cup) and one 4oz (about 1/2 cup)
I sliced the vanilla open lengthwise, leaving about 1 inch uncut on either end. Put the vanilla beans in the bottles first, (5) per 1 cup of bourbon or vodka is the general ratio. (I used (2) for my 1/2 cup bottle). Fill the bottles 95% full with the alcohol and shake well. Shake every few days for about 6-8 weeks, and they should be ready. (When they are ready you will smell more vanilla than alcohol when you do a sniff test). You can use and top off these bottles for about six months!