Need some advide please!!

So i just got a new dog tonight. I have one dog who is a medium cur mix who is territorial. I brought home a young pittie who is 1-2. They were doing fine until my pittie started drinking my older dogs water and then they had a fight. I immediatly yelled no and my cur ran into my room and the pittie to her kennel. Any advice on how i can get them to get alo