1994 Dodge Caravan

Engine Performance problem
1994 Dodge Caravan 6 cyl Two Wheel Drive Automatic 198km miles

We where driving the van back from a trip one night and the heater stopped working and was only pushing out cold air in the van. We thought it was the termistat and bought a new one and installed it. We drop up the street and all was fine. We stopped for a second and tried to start the van again and it wouldnt start it acted like it had no power so we thought it was the battery we opened the hood and played with the battery cables and it started up no problem. We drove about a block and the van started to shimmy and blow out white smoke, at this point im thinking it was the head gasket so I checked my oil and theres NO water or gas in my oil but its now leaking all the water and anti freeze from the rad but its leaking the water from the bottom of the back of the motor. Any suggestions on what this could be? Is there a hose back there that could have cracked causing the white smoke and the leaking of the water from the rad?