If none of that works → (under $15 at hardware stores) will succeed where a plunger fails 90% of the time.
If the water tricks didn't work, you need mechanical intervention. toilet plunger not working
This is the professional tool of choice for homeowners. A toilet auger (or closet auger) is a flexible, J-shaped metal cable with a crank handle. If none of that works → (under $15
If the clog is organic (waste or paper), heat can help dissolve it. heat can help dissolve it.