Prep. Prepare your gummy molds (note 5) by placing them on a rimmed baking sheet -- this makes them easier to transport to the fridge.
Combine. Pour cold water (1/2 cup) into a glass liquid measuring cup. Sprinkle gelatin (3 - 3 1/2 tablespoons) on top, and whisk until the gelatin dissolves. Set aside for 10 minutes.
Heat. After 10 minutes, your measuring cup should be full of clear jello. Microwave on high for 30 seconds. Remove from the microwave and whisk ingredients together. Return and microwave on high for another 30 seconds.
Flavor. Whisk ingredients together again, they should be fully liquid (if not, place in the microwave for another 15 seconds). Add the berry powder (3 tablespoons), sweetener (1/2 cup), and extract (1/2 teaspoon) and whisk until all clumps have dissolved.
Shape + chill. Working quickly, pour liquid into your prepared gummy mold. Place in the fridge for 45 minutes - 1 hour, or until you're able to easily remove the gummies from the mold. Enjoy!