Is it possible to feed/grow C. elegans on anything other than bacteria? i.e. would they be able to eat something like a tissue culture growth medium?
The term you want to look for in the literature is “axenic”, as in “axenic culture” or “grown axenically”.
Here is a detailed protocol from the Hamza lab : http://ansc.umd.edu/labs/hamza/pub/mCeHR%20Growth%20Medium_hamza.pdf
HTH.