Here are the steps:
With the help of a parent, take the top of the toilet off of the toilet
tank in your home.
2. Then put about 12 drops of red or blue food coloring in the tank.
3. Wait about 15 minutes. It is very important that nobody uses the toilet while you are doing your experiment.
4. After the 15 minutes are up, look into the toilet. If the water is colored blue or red, you've found a leak in your toilet.
5. If you find any coloring in your toilet, call a plumber or get your mom/dad to fix it. You could be wasting thousands of gallons of water!
Good luck water-leak detectives!