What to observe: In this diagram, you will see:

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       The fill valve located at the left of the tank.  The flush valve with the overflow pipe in center.   Depending on the type tank the water level should at least be one inch below the top of the overflow pipe. If not; you may have a sweating toilet tank due to the constant flow of cold water. Your float needs adjustments or the float need to be replaced.   Constant running water allows water temperature to fall which as a consequence causes a sweating toilet tank. This float has an adjusting screw to increase or reduce water level entering the tank.  You may not hear water leakage into tank but the over flow pipe will indicate there is too much water entering the tank.  There is another type float construction with a metal rod and a PVC or metal ball screws on the rod. With the float in place, the rod can be bent downward to reduce water entering tank. There is a valve on the fill valve where when the float is forced upward, the valve closes.  The flap is responsible to seal off or to hold water in tank until flushed. You will normally hear water leaking if this device is defective. Sometimes too it tends to ‘hang’ if chain is too short or get caught on to an object. This allow the flap not be seated properly thus will result in water seeping causing a sweating toilet tank. Use a long object. Presses down on it listen for water leak. If no leak when pressed; then you need a new flap.  IN case problem persists; then you will need to buy this item below. This item mixes the hot and cold water and centralized it to your toilet tank preventing a sweating toilet tank. This certainly saves you a four or five hundred dollars buying a new toilet and on top of that, having to pay for installation.