What your state adds
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More state involvement than most food categories, because a beverage is frequently made in a licensed facility rather than a home kitchen.
Three layers
Food business licensing and inspection, which is state or local.
Any state juice or beverage specific requirement.
And alcohol licensing, if the product crosses 0.5 percent.
Food business licensing
Most states require a food processing establishment license, an inspection, and in many cases a plan review before you start.
A refrigerated or unpasteurized product attracts more attention than a shelf-stable one, reasonably.
This is the layer that decides where you can physically operate, and it is worth resolving before signing a lease rather than after.
Cottage food rarely helps here
The point that surprises people coming from baking or jam.
Cottage food laws exist for low-risk shelf-stable foods, and most exclude beverages, and nearly all exclude anything requiring refrigeration.
So the home-kitchen route that works for a jam maker is generally not available to a juice or kombucha maker, and a commercial or shared kitchen is the usual answer.
Check your own state rather than assuming either way, because a small number treat some beverages differently.
Alcohol changes everything
A product at or above 0.5 percent ABV is federally an alcohol beverage, and state alcohol licensing sits on top of the federal requirement.
That is a separate application, a separate premises qualification, separate record keeping, and in many states a three-tier distribution structure that changes who you can sell to.
It also closes retail channels: an alcohol beverage cannot be sold where a soft drink can.
Which is the strongest practical reason to decide deliberately which side of the line the product is on.