Can fire cider be sold under the Cottage Food Law?

No.  Whether you consider fire cider a beverage or a tincture, it cannot be sold under Cottage Food Law and would require a license to be sold at the farmers market.

If you choose not to label fire cider as a tincture, it would be considered a beverage. Beverages are not eligible to be sold under Cottage Food Law, regardless of their ingredients.

If you choose to label fire cider as a tincture, it would be considered a supplement. Supplements are not eligible to be sold under Cottage Food Law, either.