I turn off the water on the TC when I go off for for a few hours. I go even further than turn off the water heater - I have a timer on the water heater that automatically turns it off after one hour.
I turn off pump on the well for the S&B when we go off for a week. Came home one time to find the pump running because the switch that turns off the pump when the pressure is high enough failed - so the pump could have be running continuously from a few hours to the entire week. Fortunately it did not burn out.
Just because you're paranoid doesn't mean they aren't after you