Clogged Toilets
If your toilet won't flush, you may have a clog blocking the pipe. Use a plunger to attempt to push the blockage through. To do so, simply put the plunger in place over the drain and press firmly to create a tight seal. Then, pump the plunger up and down rapidly to attempt to dislodge the debris.
Be careful not to flush your toilet unless the water drains out of the bowl; flushing before the clog is removed could cause the basin to overflow.
Sink/Shower Drains
If your sink or shower drain has a small clog, you may be able to remove it using a cleaning tool. Most hardware stores sell these. Please do not use harsh chemicals to clean the drain, as these could damage the plumbing system.