Sidral Mundet is an apple soda from Mexico... and is highly recommended. Its lightly carbonated flavor, influenced by actual apple juice, is very clean. It can probably best be described as tasting like an apple juice version of sparkling grape juice. And yes, it's sweetened with real sugar. Yum!
While I was living in Ingolstadt West Germany in the 80s they had a bottled carbonated apple juice with lemon. It was totally awesome and the best carbonated beverage I ever had. No sweetener added at all.
Martinelli's carbonated apple products are good too, but that extra lemon with the acidity of carbonation dried it out nicely and was well balanced.
Review: Sidral Mundet 
