I down voted because you give a dangerous advice. The concentration of salt in sea water is higher than in urine. Drinking sea water rises the level of sodium in blood very quickly which sends signal to your kidneys to get rid of that salt. But as kidneys can't produce urine with the concentration of salt higher than certain level you need more body water to excrete the amount of salt you consumed with sea water. Roughly speaking you need 1.5 liters of fresh water to excrete the salt you got with 1 liter of sea water. Eventually the concentration of salt will become dangerously high in you blood and you will die of heart failure or seizure. So I would say that drinking sea water will actually DEPRIVE you of extra day of survival which may be lifesaving.

Modern survival guides consistently advice against drinking sea water.

Speaking of Alain Bombard. The most likely explanation here is that he consumed enough FRESH water (with fish and rain water) to dilute sea water he drank to safe levels for his body.

So if you are on a boat in the middle of the sea NEVER drink sea water. This can save your life.