Don't forget this is a general flush forum so there are many different methods, see under cleanse. When I started out I tried several and they all worked.
Besides what is under cleanse you can find one in the posts from Fram, and Andreas Moritz is another one.
And some people found different ones on the internet.
For beginners we usually suggest HC since it is simple and from there they try different ones or make changes to the original ones.
The water was only suggested since so many people did not feel well and we had the info from Andreas and most people have been helped by this, but indeed it is not part of the HC flush.
Under the R ratings you can find Telman's flush by flush journey and things he tried.