The hole should seal on its own. It'll take time for the tissue (gums) to grow over the hole and then bone will eventually fill in.
But the water from your mouth should not leak out of your
noseNose fracture. There shouldn't be a connection from your mouth to your
noseNose fracture through the wisdom tooth socket area. I would recommend going back to your dentist/surgeon to get it evaluated. It may be going through your sinus and out your
noseNose fracture, in which case you may get a sinus infection. Its best to get it closed up.