Malfunctioning Toilets
If your toilet won't flush, use a plunger to attempt to dislodge any blockages in the pipes. Be careful to own flush one time to avoid any flooding. If the handle isn't working properly, lift the toilet lid to make sure the chain is properly attached.
Clogged Sinks
If your sink becomes clogged, you can also use a plunger to create suction over the drain and attempt to push anything stuck out. Do not overuse corrosive chemicals in an attempt to flush the drains.