I wish *I* lived in a place where I could find herps in my shower...all I get is squirrels...(not my shower, in my backyard.

)
Anyway, pinhead crickets should do the trick if it's that small...many petstores like Petsmart and SuperPet have them. I've never heard of the casserole stuff, but many geckos won't eat food unless its moving, unless they're omnivorous. Other than that, some pics would help us give a better identifcation...
If you don't have a digital camera, check out this site :
http://www.gekkota.com/html/gecko_photos.html
If you see anything that matches what you have, let us know
Good luck with your little guy.