Reading all the replies made me think of a situation we ran across up the Rio Dulce in Guatemala some years ago when cruising on our boat. A couple pulled in one morning after a rough trip up from the Eastern Carribbean. They seemed to really like getting into the sauce early in the day! By afternoon, I saw the old gent filling a bottle from one of the yellow diesel gerry jugs lashed to the deck. (They had about 15 of 'em)Looked like pretty thin "diesel". Sooo...I asked what the deal was. "Cheap rum" was the reply. "Filled all the diesel jugs with rum and the fresh water tanks with vodka in Venezuela before shoving off". He showed me how you could "pump yourself a drink" using the foot pump in the galley sink for a little pick me up!!
Needless to say, they did not worry about their ballast and trim at sea!