Some side quests are more enjoyable than others, while some prove more confusing or frustrating. Completing "In Vino Veritas" in *Kingdom Come: Deliverance 2* involves numerous steps and even a side quest within a side quest. Let's break it down.
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 seeks the secret to the monks' exceptional wine. Exhaust all dialogue options to learn about Havel and the book he entrusted to Adleta. This sets the stage for your interaction with Havel.
To obtain the book from Adleta, visit her garden in the southeast corner of Kuttenberg's inner walls during the morning or afternoon. Gather five marigolds beforehand. Either find her before her brother, Hugo, arrives, or speak with Hugo to gain permission to talk to her. Remain courteous when requesting the book for Casper. You can attempt a skill check to obtain it directly, or offer the marigolds as a gift. Once acquired, read the book from your inventory. Note: obtaining the book is optional.
Alternatively, proceed directly to Havel's inn in Kuttenberg. Enhance your drinking skills and wear an outfit boosting your Charisma to at least 18. In your conversation with Havel, select the following dialogue 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. Report back to Casper with this information.
Travel to the vineyard north of Kuttenberg. Initiate the "Under the Straw Hat" side quest by speaking to the recruiter (completing this quest is optional, but starting it allows free movement within the vineyard). Locate Jerome on a bench near the main building.
Enter the main building, proceed left to the storeroom, and 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.
If choosing to complete "Under the Straw Hat," perform tasks such as removing plants and moving sacks. Report to Jerome upon completion for your reward. Otherwise, return to Casper, delivering the wicks and seedlings (if collected).
This concludes "In Vino Veritas," allowing you to progress to other quests in Kingdom Come: Deliverance 2, or perhaps pursue badge and dice collecting.