When you say "artificial soundscape" does this mean you can use anything BUT the sound of water? So, you couldn't record different kinds of running water sounds? Instead you would have to create that sound with an alternative source?
I suppose the question I would ask myself is "what does running water sound like?" I think that's a very loaded question. ...
Create the sound file, bounced as a loopable file with no printed silence on the front or back
In iTunes tag it as "Part Of A Gapless Album" under Options for the file itself
Create a new playlist
Add this file to the playlist or maybe a few repeated entries of it for a good measure
On the iPod playback, go to the new Playlist, hit Play (on the top of the ...