Reasons why water is coming out of the tailpipe.
Normal cause:
water condensation
catalytic converter
engine heat
Clear smoke with water droplets means a healthy engine.
If water or smoke doesn't stop after a few minutes, stop the car! The engine might have a serious problem.
Abnormal cause:
faulty pistons or rings
blown head gasket
Often comes with oil residue, sooty exhaust, and white or blue smoke from the exhaust.