Pour 2 T. water into small custard cup; sprinkle unflavored gelatin over. Let stand until gelatin softens, approximately 10 minutes.
Combine coconut milk and sugar in heavy medium saucepan. Stir over medium heat until sugar dissolves and mixture is hot but not boiling. Remove from heat; add gelatin mixture and stir until gelatin is completely dissolved and mixture is smooth. Cool mixture to room temperature, about 45 minutes.
Stir buttermilk and vanilla extract into cream mixture. Pour mixture through fine strainer into 4 cup measuring cup. Divide mixture among six 3/4 cup custard cups or ramekins. Refrigerate until panna cotta is set, at least 6 hours or up to 1 day.
Run thin sharp knife around sides of each panna cotta to loosen. One at a time, place bottom of each custard cup in 1 inch of hot water 30 to 45 seconds; immediately invert custard cup onto plate. Using both hands, firmly grasp custard cup and plate together, shaking gently and
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