Nothing but apple. This drinks like a non-alcoholic dry cider, or even a very fruity non-alcoholic sparkling wine? Normal sparkling apple juice is quite sweet and doesn't feel all that sophisticated - this one has added dietary fiber, and is diluted to a more subtle sweetness level, meaning you can quaff freely without regret, or sip slowly from a wine glass, whatever the occasion calls for.  

About the brand:

Modern Soda is the non-alcoholic drinks line by artisan cider maker Valley Cider Co based in British Columbia's beautiful Cowichan Valley. Each soda flavour is built off of BC apple juice, diluted to the perfect sweetness, flavoured with inventive flavour combos, and carbonated. Half the amount of sugar of "traditional" sodas and ten million times more fun.

Inulin, a source of dietary fiber, adds to the perception of sweetness, and is actually a functional source of pre-biotic fiber. (Good for your gut, affects how you process sugar.) Bonus.