Is it dangerous to not drink water during sport practice?

I have a question about dehydration. I am an eighteen-year-old female and play on a varsity basketball team. We usually have two-hour practices in which we work very hard. Our coach does not give us water breaks, and usually by the end of practice, we have cottonmouth and are "dying" for water. It is horrible. Is there any way that not having water during that time can be dangerous? Sometimes the team can feel sick or weak by the end of a practice.


How can I prevent and relieve neck pain?

When I worry/stress out, I find the muscles on one side of my neck (usually the right side) begin to tighten up to the point of acute pain. On occasion, the pain reaches from the back of my ear, down my neck (the most painful point), through my shoulder, down the arm, and in extreme cases to the tips of my fingers. Two questions:

1. How do I stop this?
2. How do I relieve the pain when it occurs?

I'm currently suffering from one of these neck aches, and can't turn my head, so I'd really appreciate your response.