Bloom gelatin in the cold water by stirring the gelatin into the water to be sure it will all bloom evenly. When its bloomed melt in the microwave and set aside.
1 packet unflavored gelatin, 2 ounces cold water
Add the cream, sugar, and salt to a pot and heat to melt the sugar. You don't want the cream to get to hot because you'll just need to cool it down again. Heat just until the sugar is completely dissolved.
2 cups heavy cream, ¾ cups sugar, ¼ tsp salt
Stir in the gelatin and allow the mixture to cool 15 minutes.
mix together the buttermilk, milk and vanilla extract and add to the cream mixture.
1½ cups buttermilk, ¼ cup milk, 1½ tsp vanilla extract
Pour into vessels of choice and wrap with plastic wrap. Allow to set in the refrigerator overnight.