But if you’re looking for a real liquor-based seltzer, CANTEEN is what you need. This vodka-based ready-to-drink beverage is 99 calories, sodium free, non-gmo, and gluten free since it uses a corn-based vodka that is distilled and filtered. Moreover, it doesn’t have a weird after taste that is common with seltzers that are “sweetened” with sugar alcohol. Read more.