Possible Clues:

• Brine
• One member of overseas Special Forces nearly gets drunk at The Tap - it holds the ship up!
• What the Caribbean is filled with
• A sweater specially designed for the briny
• Not potable, but are wet as can be
• Ocean fill
• Main feature of gundog, away in Scotland for first time?
• What's found in various wet areas?
• In it, a tree was adrift?
• Saline solution