My Uncle Fred mentioned that the Navy had tried to stop sailors from drinking the alcohol by adding methanol at one point. After several sailors were struck blind from drinking it, they switched to an oil called "croton".
If they drank the alcohol cut with Croton oil, it gave the sailors violent cramps and severe diarehha, but no lasting side effects.
Their answer to this, was to distill (like a Gin mill) the oil out of the alcohol.
Uncle Fred also mentioned that they preferred Pineapple juice or Grapefruit (when they could get it).
By the way, he was a Torpedoman serving aboard subs during the war.