Dugesia are cool little things... haven't kept any, but played with them in the lab last year. We fed them hard boiled egg yolk while we were observing them... I don't know if you could keep them alive on that as their only diet though. Here's a lab exp on the web that has some info on reproduction and feeding http://www.lander.edu/rsfox/dugesia.html
Your best bet on finding culturing info would probably be to ask one of the labratory supply companies that carry them. (if I remember correctly, water quality is VERY important).
One thing, I don't think you could make a 10 headed one... I think 4 is about the upper limit where the body has trouble supporting the heads. Wouldn't really hurt to try it though I suppose.
There's a lab supply company somewhere in canada that carries them, as well as things like springtails etc... but I can't remember the name for the life of me. You could try calling your closest university and ask the biology department where they get their dugesia from.