Definitely a bummer to hear as its preventing you from enjoying your new car! Very weird to hear water in the oil pump. Echoing the sentiments of many here; definitely need to know how that happened. Is something not sealed properly? How long has the car been on the dealers lot? If it had sat for a long time rapid temperature changes may have caused some condensation, especially if the car was never really brought up to operating temp. Did you test drive the car before buying it? If so did it run ok? Would be weird for that to happen all of a sudden. Maybe some mistake was made while preparing your car for you to pick up?