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For a toilet tank that is leaking, you will need a toilet tank repair kit. This will repair a leak from the bolts that hold the tank to the bowl and the gasket that joins the 2 pieces.
Most toilet tanks are held onto the bowl with 2 bolts. But there are some that have 3 bolts. Look at your toilet before going to the hardware store, you may need to purchase an extra set of bolts and washers.
You should be able to replace the bolts by using a large slotted screwdriver, an adjustable wrench and pliers. If the bolts are rusted in place, you will need a hack saw blade and locking pliers.
In most cases this is a pretty easy project. Be careful of the porcelain, it can be cracked if you tighten down too hard on the bolts.