There's certainly not much info about it. For instance, how much does it hold?
IIRC, the SODIS people say it isn't useful for people more than 30 or 35 degrees north or south of the equator, which lets out everyone in the U.S. north of a line formed from Fresno, CA to Virginia Beach, VA.
Maybe for the rest of us, glass containers in a solar oven would do as well?
Sue