10 vanilla beans - split lengthwise 1 liter vodka Place vanilla beans in vodka bottle and seal. Store in dark kitchen cabinet for a month, shaking the bottle once a week - at least. 6 months of storage brings out the best flavor but it is fine after the first month. After using, replace with more vodka. The same beans are good for about a year. If a batch has weak flavor toward the end of the life of the beans, strain out the beans and throw in some new ones.