I don't think so. I drink at least a liter of unflavored seltzer per day and don't feel bloated. In fact I think it helps with digestion.
Unless of course your flavorings contain sodium, sodium causes bloating.
"If you pay attention to when you are hungry, what your body wants, what you are eating, when you've had enough, you end the obsession because obsession and awareness cannot coexist." - Geneen Roth