Hmmmmm....from the pic, I'd have to say it's an Eastern ribbon snake, probably a Blue-striped (Thamnophis sauritus nitae). It has a dark stripe bordering the belly scales.....so it's definitely not a Western ribbon (T. proximus) and with the pale blue side stripes and dark black body..yeh, it's got to be a Blue-striped (T.s.nitae).
As far as care for this critter.......it'll naturally eat fish and amphibians, so in captivity you're mostly going to be feeding it fish. The comets they recomended to feed it are not good for it, they're just another kind of goldfish that could cause problems with thiaminase. Rosie reds or others would be a much better choice. Rick (Cazador) is king of thiaminase knowlege so I'll pop that one back to him....as well as a translation that hopefully will be better understood.
---Roy