If a home is vacant for an extended period of time it should be winterized. Water in the supply lines and drain traps will expand if it freezes and can burst the pipes. The inspector will shut off the water to the house, empty the plumbing lines, drain the water heater, and fill all drain traps with antifreeze.
The home you purchased may have been winterized. If so, we will come to turn the water on, check for leaks, and ensure all plumbing is operational.