Let it dry, put it in rice at a place that is relatively warmed up (around 30 degrees is ideal). After that its a matter of waiting, praying and hope that it turns on later.
I would give it at least 2 days of drying. A few days more can't hurt. After that its a matter of using it again and -hoping- it works. Permanent damage due to corrosion might also occur at a later date as a result of this.