A quick google shows that plain carbonated water has a pH of 4, which is right around where it becomes corrosive to enamel. So, if you just drink a bit of water

A quick google shows that plain carbonated water has a pH of 4, which is right around where it becomes corrosive to enamel. So, if you just drink a bit of water afterwards, you should be bringing your mouth's pH well above 4. Maybe swish it around as well.