Yes but its not gonna be water unfortunately. Its been some time since I last checked out the details of it so Im a bit rusty but... the current Fusion research is IIRC focusing on the easist fusion process which is the deuterium-tritium which is gonna leave a radioactive powerplant after its burned out (after 30-50 years of use or whatever)

The best but also most difficult one is the Helium3-Helium3 which has no problems with radioactivity but there is not much helium3 (taken from seawater AFAIK) for the whole world to use for very long, but can be mined from the Moon and yes its been calculated that it actually is worth it to start a mining operation to get the few tons or something like that we need.

But there might be someone who knows more about it than me...very likely indeed


CBR