I would be careful about limiting water but that is just me I have never put a limit on water for mine unless there is a medical reason, check with your vet too. I would start with the no bite command when ever his teeth touch skin and give Harry a toy instead. Am guessing Harry is young and depending on his age he will start to loose his puppy teeth, just like with skin babies teething hurts and he will likely chew more to relieve pain and pressure of new teeth coming in. This is also a good time to start with basic training like sit, watch and no bite. My Sarah was and still is a chatty girl