In a small saucepan, combine 1/2 cup of the sweetener with the water. Heat over medium, stirring occasionally, until the sugar fully dissolves, creating a simple syrup.
Remove the saucepan from heat and let the syrup cool for about 5 minutes.
Add the fresh cranberries to the syrup, stirring gently to coat them evenly. Allow the cranberries to sit in the syrup for about 10 minutes.
Using a slotted spoon, remove the cranberries from the syrup, letting any excess syrup drip off.
Spread the cranberries out in a single layer on a wire rack or parchment-lined surface to prevent sticking. Let them dry for about an hour until they feel tacky to the touch.
Place the remaining 1/2 cup of sweetener in a shallow dish. Roll each cranberry in the sugar until fully coated for a frosted, sparkling appearance.
Transfer the sugared cranberries to a clean baking sheet or plate and let them dry for an additional 30 minutes, allowing the sugar to harden and create a crunchy texture.