Its running hot, where do I put the water?

What is your question?

My car would not start. But everything in my car was still working. The lights, radio, air etc.So I replaced the alternator. They returned my car, it was running hot and water was gushing from a hose. He also said that a fan would not shut off. But when he put water in the car he only put water in the plastic container under the hood. Was he suppose to put it in the radiator as well? Or does it run from that container to the radiator?