Sorry if these questions seem like I don't know how to care for a water snake, but truth be told, I don't. I typically care for corn snakes, but I recently got a northern water snake (found in a high rise by a friend of mine) and they want me to take care of it initially (I'm the only person they know who cares for any snakes at all) until it is healthy enough and I can show them how to care for it properly.
I admit I didn't even know what it was until it was identified for me recently.
My questions are probably the very typical ones (for which I could find next to nothing on the internet, even after an couple hours of looking).
1. I breed mice for my corn snakes --- would he eat these, or should I be using fish (like minnows, gold fish, etc.)
2. Temp wise, I doubt they are tropical, but would they need higher than room temp (mid 70's)
3. I know hatchling corn snakes tend to do better in smaller enclosures, is this also true for the northern water snake?
4. Would he require a tank with an elaborate aquatic setup, or simply a large water bowl?
5. I imagine humidity would be a much bigger deal for the water snake than for the corn snakes (they don't care much except when they are shedding), what do you guys recommend to keep up the humidity (misting regularly, using a fogger, etc.)
6. I keep my corn snakes on wood chips, however, I have no idea what substrate to use for the water snake, so any advice would be welcome.
7. Also, I read they can be quite aggressive. Would this be stress related or just in general?
Thanks for reading, and any advice would be greatly appreciated 
pic of the little guy
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"If more of us valued food and cheer and song above hoarded gold, it would be a merrier world."
J.R.R. Tolkien

