I don't think a water squirt is going to do any good.
My Pixie loves to chew, and was doing the same kind of things. I bought several types of dog chews, cat chew sticks, and put them in various places where I saw her chewing. Then when I saw her chewing on something bad, I'd say "NO, NO, please" and give her the rawhides instead. It's working fairly well now, I see her chewing away on one of the sticks when she gets the urge to gnaw on something. I also rub some of the treats on the hides to make them more attractive.
She's a little slow (bless her soul), things don't click as fast in her head, so it took several months of consistent training for her to "get it".