How To Flush A Toilet When There Is No Running Water. So, when water is off, check if there is some water left in the tank. The first thing you’ll want to do is to check the toilet tank.
If you have already flushed the toilet after the running water stopped, the tank will be empty. You can then flush your toilet with the flush handle as you normally would. The water in the toilet tank will last one flush.
Collect the water in a large bucket that you will be able to lift and pour.
Try plunging the toilet or clearing the main vent by spraying water into the vent opening if there seems to be enough water flowing from the tank to the bowl. Use a bucket of water (or two) to flush the toilet. Remove the toilet tank reservoir lid. If you have already flushed the toilet after the running water stopped, the tank will be empty.