Plunge it hard, get a big bucket of hot water and pour it in being careful not to overflow, pour in a whole quart of liquid soap, wait a half hour, a teakettle of boiling water. Plunge more if necessary.
If I don't have a plunger, I squirt about a cup of handwashing soap from kitchen. Don't stir, just let go to the bottom. If tissue is in the way, take a throw away object and move the tissue out of the way so soap can get to the bottom. Wait about 20-30 minutes and flush. Be sure to keep hand on handle in case you need to stop water. When I flush I stop water from overflowing and wait and lo and behold it all goes down.
Thank you 🙏🏼
It takes a little bit of finesse to do this, but it usually works. Push down on the toilet flush handle just a tiny bit so water flows in to the bowl, but not out. When the toilet has enough pressure in the bowl, it will flush with a large volume of water and clear the clog. This only works if it is normal toilet stuff causing the problem. If someone flushed a cell phone or toy down, you will need to pull the toilet and reinstall after fishing out the offending debris.
If you don’t have plunger you can add half cup of baking soda and then pour a cup of white vinegar into the bowl to unclog it.