My Navy coffee cup

A friend's father was a navy aircraft carrier vet. He always complained about his wife's coffee when he was home on leave, said it didn't taste right.
He told me that on every carrier, somebody eventually makes a mistake and pumps fuel oil or kerosene into a fresh water tank. Even after clean out there's still a whiff of kerosene.
Without a tinge of kerosene, land-lubber coffee didn't taste the way he was used to.....