There are at least 10 groups with the name H2O (including H₂O):
These are photos from concerts where H2O played, so they may be of other bands that played the concert as well.
Orange 9mm / H2O / Farenheit 451 / Man Will Surrender Dec 12, 1997 Detroit, Michigan, United States Uploaded by Daniel Sylvester
Vans Warped Tour 1997 Jul 23, 1997 Clarkston, Michigan, United States Uploaded by Daniel Sylvester
Vans Warped Tour 1997 Jul 22, 1997 Cleveland, Ohio, United States Uploaded by Jessica Anshutz
Sick of It All / Snapcase / Vision of Disorder / H2O / AFI / Ensign Apr 5, 1997 New York, New York, United States Uploaded by Liz Sets Fire