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In page James Lind:

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In the 18th century ships took along water, cordial and milk in casks. According to the Regulations and Instructions relating to His Majesty's Service at Sea, which had been published in 1733 by the Admiralty, sailors were entitled to a gallon of weak beer daily (5/6 of a British gallon, equivalent to the modern American gallon or slightly more than three and a half litres). As the beer had been boiled in the brewing process, it was reasonably free from bacteria and lasted for months, unlike water. In the Mediterranean, wine was also issued, often fortified with brandy.[citation needed][1]