Connect the fans to outdoor extension cords and keep them running continuously. If water has gotten into electric receptacles, turn off the power to the outlets and drain the fixtures. If you have water damage in a wall or ceiling, the first thing to do is drain the area. Then remove any wet insulation. If there is just a small amount of water damage to plaster or wood you may be able to just let it dry.
Time is critical.
If you can open up the wall or ceiling, remove wet insulation and start drying the area with fans within 48 hours there is little health risk. If an area has been wet for three days or more, never attempt to dry it with fans. After 72 hours only commercial dehumidifiers should be used safely. Blowing fans will spread contamination throughout the house. The reason for the time limit is that after 72 hours the bacteria count in drywall that has been soaked with clean roof water is as high as that of drywall soaked a day in sewer water.