A sizable fraction of the liquor on the US West Coast comes from Frank-Lin Distillers Products.[1] They used to be near the San Jose railyards, but now they're in Fairfield, with better rail access. They need rail access because the ethanol comes in by the trainload, in tank cars.[2] One of their major suppliers is MGP Ingredients in Illinois. They used to be called Midwest Grain Products, and before that, Midwest Solvents. MGP provides pure ethanol to both the beverage and gasoline industries.
Frank-Lin has their own water deionization and filtering plant on-site, to take all the minerals out of tap water and have just pure water. They do some additional processing on the ethanol to remove trace impurities. Then they mix ethanol, water, and flavoring to produce beverages. They have about a thousand different products - vodkas, gins, brandies, bourbons, rums, and wines, but only about a hundred different recipes.
Each brand has its own bottle design and label. The Ball bottle-making factory is conveniently next door. Frank-Lin has an advanced bottling line that can automatically change from one bottle to another without a shutdown.
Frank-Lin also does "contract bottling" - they will make your brand for you. They used to make Skyy Vodka. Skyy was a virtual company - everything was outsourced, like a app startup. Skyy was bought by a major distiller a few years ago, which pulled production in-house.
Once you get past the marketing, that's the reality.
[1] http://www.frank-lin.com/ [2] https://www.google.com/maps/@38.278159,-121.973672,3a,75y,11...