recommend get a smoker
i recommend you get a weber rocky mountain smoker it makes life so much easier then having to watch the kettle grill constantly especially if your water was boiling. sounds like you didnt have your charcoal to one side in the grill to do indirect heat.
nmake your life easy invest in a weber smoker i have two they are 12-15 years old still going stronghttp://thebarbecuemaster.net
alan weber smoker,one touch,go anywhere,masterbuilt