I havent personally used a whine kit at all. When ever the call to whine has taken me i have simply fallowed a very very simple recipe
X gallons of fresh unpasturized juice (bought from the local organic food store for more money then god normally 8-15$ per gallon)
input required number of camp tabs for treatment
research yeast to use while treating, and purchase as well as assemble any aditives required (citic acid, tan, or etc) and input those as well.
Pinch yeast when required and keep track.
Made a great batch of cherry champagne this way, as well as 3 other wines which got good reviews from friends and family. you might just try keeping it simple as that, rather then trying to find a kit that can match your requested volume... or if your uncomfortable with that then buy a full kit and cut it in half...
Twin Ogre's Brewing Co.
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Ginger mead (3 Gal)
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Australian Lager (5gal)
Operation "Black Gold" (High ABV) (5 Gal)
Stright Juice Cider