Axenic Media

I am searching for a source for C. elegans axenic media similar to that described in Szewczyk et al., 2003 ( )
Also, if you know of similar or better alternative axenic media types please let me know.

Best regards,
David B. Doroquez, Ph.D.
Postdoctoral Fellow
Piali Sengupta Laboratory
Department of Biology
Brandeis University