Greg–
Cramping is usually a hydration/electrolyte issue.
After total body deep tissue massages stuff is worked out of your muscles that you need to get flushed from your system. Treat it the same as a workout up your hydration requirements. If your hydration is out of whack before you’ll need to add more. Hydration before plays a role. 1/2 your body weight in oz is a minimum. Add to that for workouts etc.
Make sure you are absorbing what you are drinking. Aquahydrate is a solid water to be drinking or add a Nuun tab to your water a couple times a week.