Any non-fermentable sweetener. You don't need much - 4tsp/gallon will get you to medium, or medium dry - but that may depend how acid your base juice was.
Powered is cheaper but best thing to do I have found is to pit some TV in a pint glass and add the sweetener bit by bit to your taste then scale it up for your batch. Adding super will cause it to ferment again but that's ok if you want to carbonate it.
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