In a medium saucepan, place water, coconut milk, and Truvia and whisk well. Sprinkle gelatin a little at a time, whisking continually. You may see a few small lumps, but these will disappear once you heat the mixture. Cook over medium heat, whisking frequently until the gelatin and Truvia have dissolved.
Remove from heat and stir in coconut or vanilla extract.
Pour cream into six 4-oz serving dishes. Refrigerate for at least 4-6 hours for a firm panna cotta.
For a vegan option use agar agar instead of gelatin.
See the article for notes on how to make a good panna cotta.
Ensure that the gelatin is WELL dissolved. This will make all the difference between this recipe setting--vs. you having to drink a delicious soup instead.