How to fix a leaky supply line on a toilet video. Replacement parts can be found at your local home improvement store. Make sure to turn the water off at the supply valve located at the bottom of the supply line and the wall. If there is no valve, you'll need to turn the water off where it enters your house.

Make sure not to over tighten. If you're getting a drip with the new supply line, try using thread tape at the connections.

If you are installing a toilet after you added tile or hardwood floors (and raised the level of the floor) you may need an extra ring of bowl wax. It's always good to replace the bowl wax each time you remove a toilet. You also want to replace the water supply line and the "guts" of the toilet if you are re-setting the toilet after a remodel job.