Lay a plastic tarp on the floor directly below the ceiling leak. Set a bucket on top of the tarp.
Stand a stepladder on the tarp, directly below the area where water drips from the ceiling. Use a stepladder that allows you to reach the ceiling without standing on its top two rungs.
Climb the ladder slowly. Stop climbing at the lowest rung from which you can safely reach the ceiling.
Force the tip of a scratch awl through the ceiling. Leave the awl in place. Slide the bucket across the tarp until it sits under the awl.
Move the awl handle in a circular motion to enlarge the hole. Pull the awl from the ceiling. Move the bucket until it catches the water flowing from the hole.