If its water and not antifreeze, Then that is called condensation, Its winter time and the exhaust system is cold and when heat flows through it, it starts to sweat.
if it is lowering oil and water both and is not leaking it may have a blown head gasket and it is going out the tailpipe
if you have a leaking water pump gasket i thing bay a new one is better
Possible leaking hoses or water pump
could be freeze plug, or intake leaking
ac or exhuast
Steam from the tailpipe, and water in the oil means you have a faulty head gasket. Not a good thing. The steam is the antifreeze/water coolant leaking into the heads (bad gasket) getting heated by the engine and coming out as steam. The water in the oil is the same deal, but it;s collecting in the oil so it isn't coming out of the tailpipe. You need a new head gasket. I promise.
Heater core leaking?
When it starts leaking are making noise.
If there is coolant coming from it and it isn't a hose.
water leaking uper engin
If the pump is leaking or noisy then assume it is failing.
bad head gasket