Welcome, my name is XXXXX XXXXX I will do my best to help you with your issue.It can be as simple as just turning the water on but it's best to have a plumber do this just incase there are problems
Typically winterizing a house is more involved than just putting anti-freeze in the toilet. The water is turned off and the pipes should be drained along with the water heater
If the heat has been shut down and you have a hot water heating system the system should be filled with anti-freeze but sometimes the system is drained instead
Okay so I need a plumber to make the home live in ready for heating and toilet, water, etc?
That would be the wise thing to do. just to be sure everything is working properly before you move in