HELP! White Smoke

Truck running fine yesterday, get a car wash at an automatic one and then parked it overnight.

This morning I go to start it up and get down the street to a stop sign and the truck is billowing white smoke out of the exhaust pipe (Not just a little, like dense thick clouds).

I immediately pull over thinking blown head gasket, but after getting out and watching it idle for awhile -
1. The smoke never subsided even at idle.
2. Smoke is white but does not smell like coolant/burnt oil and water.
3. Truck was not overheating and coolant levels did not drop.

Took it home, drained the oil and oil looks fine.

Any ideas? I was reading it could possibly be Trans fluid from the auto transmission?

I am going to throw in some head gasket repair fluid now and give it a coolant/oil change to see if that fixes anything and then it is off to ordering a head gasket set.

 

Water in the gas from missing gas cap?