usually u can watch them on turbonick.com but they only hav a few
you can watch i think most of them online athttp://www.yidio.com/show/h2o-just-add-water
www.youku.com www.megavideo.com www.sidereel.com itunes
Probably Youtube but just a guess
I have found several episodes on youtube just search The Adventures of Sinbad.
some of them are full but most of them are just clips
You can buy seasons 1-9 at any good music/ DVD store, depending on where you live. In some countries, the episodes are available through video rental services. In the US, they are available through NetFlix and Blockbuster.
Well , sometimes i just watch it in youtube i see all kinds in there music , episodes , and movies
There are loads of sites just try Googling 'watch h20 just add water online' and take your pick
They are currently showing season 2 on channel 10 or can watch the episodes on YouTube.
at teletoons website just click videos scroll find it and choose the episode
Netflix, Hulu, Or you can buy all the series on Ebay.
you can watch free mad tv episodes or any tv show or movies for free at www.tvshack.net