Depends on the type of fish…goldfish and plecostomus and other hardy fish should be fine. When we had tropical fish, though, we erred on the side of caution and used purified water from the store.
Oh yeah, goldfish are quite hardy. [name_f]Remember[/name_f] to equalize the temps in the water when transferring the fishie and you should be golden. hah! (didn’t realize that was punny til it was already typed…)