How to Complete In Vino Veritas in Kingdom Come Deliverance 2

Some side quests are more enjoyable than others, but some can be quite confusing or frustrating. Completing "In Vino Veritas" in Kingdom Come: Deliverance 2 involves many small steps and even a side quest within a side quest. Let's break it down.

Speak with Casper and Havel

Begin "In Vino Veritas" by speaking with Casper Rudolf, located at his drink cart on the east side of Kuttenberg City (easily found by proceeding straight from the east gate). He wants to discover the secret to the monks' exceptional wine. Exhaust all dialogue options to learn about Havel and the book he left with Adleta. This informs your approach to impressing Havel.

To obtain the book from Adleta, visit the southeast corner of Kuttenberg's inner wall during the morning or afternoon. You'll find her in an open garden. Gather five marigolds beforehand. Either find her before her brother, Hugo, arrives, or speak with Hugo to get his permission to talk to her. Remain kind to Adleta; explain you need the book for Casper. You can attempt a skill check to obtain it, or gift her the marigolds. Once you have the book, read it from your inventory. Note: Obtaining the book from Adleta is optional.

Alternatively, proceed directly to Havel at his inn in Kuttenberg City. Improve your drinking skill and wear an outfit boosting your Charisma to at least 18. In your conversation with Havel, choose the following options: Germany, "Let's do it," "That's a very fine gift," Steinberger, "It's missing ginger." This impresses Havel, revealing the monastery's secret ingredient. Return this information to Casper.

Find the Monastery’s Secret Ingredient

Travel to the vineyard north of Kuttenberg. Speak to the recruiter to begin the "Under the Straw Hat" side quest (optional, but allows free movement within the vineyard). Find Jerome on a bench near the main building.

Sneak into the main building, turn left, and locate the storeroom. Use your lockpicking skills to open the chests; inside you'll find the Sulphur Wicks needed for Casper. For extra Groschen, collect five seedlings from the garden behind the main building before leaving.

To complete "Under the Straw Hat," perform tasks like clearing plants and moving sacks, then report to Jerome. Otherwise, return to Casper with the wicks (and seedlings, if collected).

This completes "In Vino Veritas," allowing you to proceed with other quests in Kingdom Come: Deliverance 2, or perhaps pursue badge and dice collecting.