Here: http://tv.blinkx.com/show/h2o-just-add-water/hOpsLDonNRq7ZwD37Ms9z1vbo4E#s2e1
hope i helped!
PS: when you have finished with the 1st season on there, you can watch the 2nd season after :P
anyways, again, hope i helped :)
http://vids.tv/H2O-Just-Add-Water/tv/season-2/episode-12-Monster
at http://www.yidio.com/show/h2o-just-add-water
At www.veoh.com
Season 2, episode 2: "Control"
at http://www.yidio.com/show/h2o-just-add-water
The last episode of H2O:Just add water is season 3 episode 26 and it is called graduation.
watch online through http://www.yidio.com/show/h2o-just-add-water
you can just go on the official site: noordinarygirlmoonspell.webs.com
On youtube. The episode is called 'Just A Girl at Heart' I think
through links on http://www.yidio.com/show/h2o-just-add-water
through http://www.yidio.com/show/h2o-just-add-water
All of the episodes are on free-tv-video-online.info search for h2o just add water :)