What non-perishable, non alcoholic beverage would you say is unique, or associated with San Diego?
While Carne Asada Fries, California Burritos, and Fish Tacos are often considered uniquely San Diegan (at least within the US), and San Diego has a pretty good collection of microbreweries, I can't think of something more durable (can withstand an airplane checkin) that would be considered San Diegan, or Californian, for that matter.
7754 Starling Dr, San Diego, CA 92123
I'm not familiar with it, but Pizza Port does brew their own root beer, though of course root beer isn't unique to San Diego.
Outside of that the only thing I can think of that's non-perishable and non-alcoholic, but IS NOT a beverage, but is very much associated with San Diego (OK, technically Escondido) - is Dr. Bronner's Magic All-in-One pure castille soap!
Ballast Point makes a bloody mary mix that does not have alcohol in it. If you are a tomato juice drinker, that could be good. If youa re OK with non-beverage liquids, Stone Brewery makes a line of condiments, including mustard, hot sauce and bbq sauce.
Non-perishable, non-alcoholic liquid associated with San Diego ... sea water? Oh wait, beverage...
Mexcian cane sugar Coca-Cola (or other sodas) is really the only thing I can come up with off the top of my head. I know it's not *technically* from San Diego, but most people in most parts of the country associate us with the border..