Inside the tank are two bolts holding the tank on to the base. Unscrew these two bolts and carefully lift water quality the tank from the base. Remove tank to the trash.
When you get to the house stand if front of the toilet and locate the water shut off valve. Should be down below the toilet on the wall. Just turn it off (righty-tighty) completely and flush the toilet. All the water should have left the tank, well at least most of it. If there is remaining water line repair get it out with paper towels or a rag. The important thing is that no more water came in. If it did then your valve is not shut all the way or not working and you need additional help.
Leaks can occur anywhere in your reverse osmosis water filter system. If this ever occurs, check the source of the leak. It may be from the hoses, fittings and the valves. Most of the time, some kind of tightening might be necessary. So make sure to securely tighten the fittings. If this does not work, you may need to replace the filter itself, however that might take a bit more work.
10) Tighten down the closet bolts making sure NOT to use too much torque. You aren't installing tires on a race car here so, take it easy Mr. Goodwrench. You just want to hold the toilet in place, not crack the porcelain base of the toilet or damage the drain flange.
Remove the cap of the faucet using slip-joint pliers. Tape the teeth of the pliers to prevent damage of the surface. Remove the faucet cam washer and water line repair the rotating ball.
There are a lot of different shapes and styles of toilets but, with a few exceptions, they all work about the same. Water is released from the tank (many commercial toilets use a special valve instead of a tank) into the bowl to flush the waste into your drainage piping. Basically pretty simple, right?
A large plumbing job, such as re-piping or installing additional fixtures, may require a permit. Check with your city's department of building and safety before asking for estimates, and avoid any plumbers who are reluctant to comply with regulations.