"Au Naturel" can mean many things. It's handy when we want to make "naked" sound more sophisticated than vulgar. And in the world of food, it presumably means something derived from "natural" ingredients. But when it comes down to it, the definition of "natural" is a fuzzy one. Jones Soda just released their new "Au Naturel" line—three sodas sweetened partially with stevia, with 35 calories and much less sugar (7g) than a standard bottle. We've had a number of low-sugar sodas we've liked recently. How would Jones fare?