You can have up to 50% fizzy water. The “approved” mineral water (because it’s naturally carbonated) is: https://www.gerolsteiner.de/en/mineral-water/gerolsteiner-sparkling/
You can have up to 50% fizzy water. The “approved” mineral water (because it’s naturally carbonated) is: https://www.gerolsteiner.de/en/mineral-water/gerolsteiner-sparkling/