Based on your description of how you lost heat after 10 minutes of driving is an indication that the vehicle was loosing coolant. When the level gets low the vehicle can no longer circulate coolant through the heater core, this causes you to lose heat. My suspicion is that the vehicle suffered a fairly serious leak while you were driving (since you had not seen a leak previously) and once the coolant level got low, everything else you're describing is consistent with an overheating cycle. The smoke coming from the exhaust is a strong indication that the head gaskets have blow. Depending on how long you drove after this point and how hot the engine got, the cylinder walls could also have suffered damage which will require a new or rebuilt engine to correct the problem fully. Most likely it is that steam in the system that caused the melted coolant outlet housing. When a vehicle is overheated to that extreme all components should be suspect and inspected; i.e.- Radiator, heater core, hoses, etc.
See that's the thing, after it cooled down enough I was able to put water (for now) into the reisevor and my car Startex perfectly fine no noise no smoke from the exhaust (although the throttle bolt thing was still on on the dash). I had to get it from my sister's to my parents house which was like 2 minutes away from each other (just a couple blocks) and it ran dine to get it there. I just can't trice it to were it get warm or the water would have spewed out. So would that mean I'd still have to replace or rebuild the engine after I put this part it since it sounded perfectly fine? Also I didn't lose heat after 10 minutes I driving. I'd been driving about 40-45 minutes then lost heat then 10 minutes later is when the overheat light came on then everything else happened