I love Sidral Mundet.
If you've never had it, you should at least give it a try. It is an apple-flavored soda and it is far and away my favorite carbonated beverage. It's not a syrupy, candy flavor. It's made with real apple juice. It's so delicious.
Albertson's and Walmart don't carry it (at least the ones in my neighborhood don't), but I think most grocery stores do. Especially the Western Family grocery stores (but this isn't a Western Family product). But it's not in the beverage aisle, it's with the Mexican foods. I don't know why it's not more popular with us gringos.
P.S. My husband just sent me this:
"The drink has been renowned in Mexico for its nourishing and hydrating abilities and has sometimes been used as a home remedy for stomach aches."