I cut my grass, in the cleanup I got some water on some of the lawn, it is turning brown, what need I do?

Water will not turn your lawn brown. It sounds more like you cut it too short. If you are cutting your lawn properly, you'll cut only 1/3 of the leaf blade at a time and cleanup should involve a blower or broom and letting the clippings re- feed the lawn. Using a hose is a waste of water.