Take the belt off and start it before it does crack!The freeze plugs almost never work-im in indiana and i see all kinds of autos like this.I cant understand why someone wouldnt use antifreeze when you can buy a gallon of it for 6.00 at the dollar store(full strength).Id say your lucky if it isnt smoked,and besides-plain water?Your engine has gotta be all rusted to heck on the insides