Drinking some seltzer water everyday shouldn't do you no harm and it's much better than drinking soda everyday which can cause kidney problems.
Still pure water is best to drink instead of seltzer water but as long as you're drinking some plain water along with drinking the seltzer water then it's fine to drink the seltzer water everyday.
Just be sure to drink other healthy drinks such as juice, tea and yes regular water at least during some of the days to keep your body healthy.