There is a freeze plug on the back of most engines that or a hose is leaking. Start with the hoses that go thru the firewall to the heater core inside the car. Good Luck and Remember.
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There is a pipe on the rear of the engine that carry water between each cylinder head and 2 small hose that carry water also on the rear of the engine.
The sound of water bubbling inside the cab after you shut the engine off is a sign that the radiator is low, you must likely got a small coolant leak somewhere on the engine.
I would say that you are losing coolant somewhere hoses,water pump,radiator.
WATER PUMP RADIATOR HOSE OR HEATE RHOUSE MAYBE EVEN A FREEZER PLUG ON THE ENGINE POPED OUT
No
Pure water will freeze below 32 and water tends to expand as it freezes. It could damage the engine block, heads and radiator among other things. If you could get the car to run the engine block will melt the water in the engine but the parts that don't melt will trap the water as it becomes super heated. Head gaskets, the heads themselves and the engine block can be damaged. The superheated water will be like a bomb and will eventually get out somewhere in the system.
There is a water leak somewhere in the block.
Not good. Head gasket or cracked head. Exaust is getting into the water jacket somewhere. blown head gasket, or cracked head.
You are getting water on an electrical component somewhere. Check to make sure you haven't lost any of the plastic shrouds on the engine, or any place you could get water in a connector.
It could be a bad water pump if it's leaking out the weep hole at the bottom of the water pump.
There could be a couple of reasons why water is coming from a tailpipe. There could be a blown head gasket on the car or a cracked head. A small amount of moisture is a normal byproduct of the burning of gasoline in the engine.
Usually at the front end of the engine, driven by a belt. Some cars have a back-up electric water pumt somewhere low in the engine bay.