Thanks MBarnum, JRand and Ginny. I have turned the water on once and turned it off again. Since I don't have water flowing out of the pipes anywhere, I don't see the harm in turning it off and on as needed. (If you know what I mean)
I also went to the office and got some work to do here tomorrow and called the AM client and left a message to call before coming to her appointment, just in case I can't get there. SO, if the plumber I called can't come in the morning, I have another I like that I can also call.