How do I stop my toilet tank from sweting?

For r sid... do you mean condensation buildup on your bowl and water closet? Turn your A/C down (although probably not the prob). Do you live in a really humid area? Do you have an evap cooler? No a/c or evap? Just how much sweat do you see on your tank? A few drops? Does it drip on the floor? Are you sure it is not a water closet leak?

r sid, is the water in the tank hot/warm? I have seen plumbers accidentally feed the toilet with the hot water line.
Sorry Admin, no where else to answer.