First, find out if the ceramic is porous or not. Ceramics, like plates and cups, can be repaired if you act quickly. The porous ceramic must be moistened on the broken edges before applying the glue. This helps the glue adhere more strongly to the ceramic.
Then put the pieces together very gently and allow them to dry. You don't have to throw things away as soon as they break. With a few smart ideas and the philosophy of reducing, reusing and recycling, most broken things can be fixed or even turned into something better. Bored Panda has compiled some of the best examples of these ingenious DIY projects to unleash your creativity.
If the repair is quite complicated or beyond your means, check with a local furniture repair shop to see what it would take (and how much it would cost) to fix it. Some of us may remove the top of the tank and look for temporary solutions, but if you follow the toilet troubleshooting in this Home Repair Tutor video, you can probably fix the problem once and for all.
