Diamondback water snake questions

[Caddyspaddy]

I rescued a baby snake from my sisters cat about a month ago. Thought it was a rat snake but turned out to be a water snake, either diamondback or brown. I heard these guys can be nippy but im hoping to tame it down since its super young. Right now it each super small frozen pinkies and crickets because I didn't know it was a water snake. Ive had a water snake temporarily in the past but was way bigger and darker and nippy. What are the chances of me taming this one down? Its no nippy at the moment. I have it in a kritter keeper but have a bioactive enclosure im waiting to grow in before i transfer him or her. Any advice is welcomed too. Couldn't find any info on growth rate, anybody know about that. Ill try to attach pics