You can take your favorite stout - Solomani Scouts still use Guinness, traditionally - and pour it into a vacuum-proof bottle (i.e. one that won't just shatter or crack in vacuum). Many StarshipMarts sell bottles made specifically for this. Make sure the bottle and any accessories are adhered to the Hull just before Jump Entry. Some say that old denture fixate works great for adherence. Remove from the Hull, just after Jump Exit.
Repeat before and after each Jump until 7 Jumps have passed, or as desired for taste. Although there is little agreement on how it should taste different than regular Stout.Some Scouts have even gone to great lengths to brew and distill the Stout on the Hull while in Jumpspace. Many use Robots, others have more secretive means.
Citizens ask who is in charge on a Scout ship. A lot of Scouts think it's the Scout with the most Jumped Stout.