Step 2 · Shut Off Water and Drain Toilet Tank
Locate the water shut-off valve, typically an oval-handled valve on the wall or floor behind the toilet. Turn the handle clockwise until it stops to shut off the water supply. Do not force it. Next, flush the toilet and hold the flush handle down to drain as much water as possible from the tank. Use a sponge or towel to soak up the remaining inch or so of water from the bottom of the tank.