If your toilet clogs, you can generally clear the drain with a plunger. Press the plunger over the drain and pump up and down to clear the blockage. Don't flush multiple times or you could flood the bathroom.
Other Drain Issues
If you're having problems with your sink or shower drains, you can also use a plunger to push the clog through the pipes.
If you don't have hot water access in your property, check the settings on your tank. Attempt to cycle the tank or reset it; if you make any changes, wait at least 15 minutes before testing the water temperature again.