In a small bowl, mix together the water and gelatin together. Set aside.
In a small saucepan, mix together the heavy cream, sugar, vanilla bean seeds, and vanilla bean pod. Heat over low heat while continuously stirring until it reaches a low boil.
Immediately remove from heat and discard the vanilla bean pod.
Slowly whisk in the buttermilk, then the gelatin. Stir until the gelatin is dissolved and thoroughly mixed in to the milk mixture.
Pour the mixture into small ramekins or other containers. Tightly cover and chill for at least four hours.