Probably Stolen Wine: Fermentation and Selling
Unlock Retired Winemaker in Wild's Network, fill a Wine Bottle with 750 ml of suitable water, add one or two BloomBerry handfuls and optional standard Yeast, then open the bottle panel and press Start Fermenting. Merely placing ingredients in it does not start the process.

Use the kit and read the manual
The upgrade's photographed description grants a Winemaking Starter Kit and recurring visits from a retired winemaker. The kit includes bottles, berries, yeast and the BloomBerry Wine Fermenting Guide. Open that guide before investing in a large batch. Its first page, also visible in an official store screenshot, shows the basic ingredients.
Start a small controlled batch
Use Basewater or High Quality Water for the first test, avoiding the published disagreement about Pure Water. Fill the bottle, open its inventory and add berries plus standard yeast. Click Start Fermenting and read the countdown. A launch-era photographed batch with yeast shows two days; the community's longer base time is not the same yeast-assisted configuration.
Inspect the fruit and finished product
Use the magnifying glass to examine berries. The manual distinguishes normal, underripe, moldy and small bunches. Finished wine has a different identity from an empty household bottle. Confirm the finished tooltip before presenting it to a Substance buyer; also check that buyer's budget.
Keep Wine Extract separate
UPDATE 049 says pouring wine into another liquid container produces Wine Extract. That liquid is distinct from the finished bottle you intend to sell. Plan the destination before pouring. Aging and buyer modifiers can change a bottle's value, so compare actual quotes instead of treating one photographed sale as guaranteed profit.
FAQ
Why is my wine still a Household Good?
Open the bottle and check whether fermentation was actually started and completed. Ingredients alone are not finished wine.
Is yeast mandatory?
The official recipe marks it optional. Standard yeast speeds fermentation; use the bottle's countdown for your batch.