if the ceiling is holding water, use a screwdriver or pen and poke a hole in the center of the bulge. this will funnel the water to that one spot saving the ceiling and helping to collect the water in one stream.
collect water - obviously pots and buckets work well, but the best thing to use on large leaks is your garbage pail, provided by your local waste management. these pails have a larger capacity than most other types of buckets - as well as wheels, making it easier to empty.
protect belongings - if there are any items in the room that could be damaged by moisture, either move the 