Here's a simple test;
1> Sip on water, do not gulp it down you will get a painful stitch in your kidney from of the pockets of air between each greedy gulp!
2> Wait until you need to pee!
3> Check colour of pee!
This is your guide-
If it's yellow you are not hydrated, wait! Keep sipping water until it is crystal clear.
If crystal clear, do some gentle breathing exercises for a few minutes before starting your warm up routine.
You are then ready to rock.....
Get it right and have a good fight!!!