Please Help!!

[holdendillard]

My moms boyfriend brought home a Florida water banded snake last night but I didn't know because he wanted to surprise me otherwise i wouldv told him to just let it go. So the next morning i went to my moms house and i saw that it was in a plastic container with nothing but cedar chips in it! I moved him into a bigger container with eco earth, a hide, water, and a heat lamp. the snake was obviously sick because it barley moved when i picked him up. no sign of aggression which is weird for a water snake. i kept it in the new enclosure for awhile and decided to let it go near a pond. But when i did he didn't try to flee as you can see in the picture. I really don't know what to do, i have never been in this kind of situation before so any help is appreciated.