(just a bit of railroading to make up for my absence)
After searching the whole house you find no further druids, but also no sign of Davian's family.
Davian returns to you, meeting you in the fermentation room where he inspects the wine, which has definitely been poisoned.
Davian: "It's no good. We will have to start all over. But before that, my family must be saved. Yester Hill and the Ruins of Berez. I will join you, we can take my wagon. You said you needed to take wine to Urvin? It's not really on the way I'm afraid, and we must hurry."
He shows you a hand drawn map of the land:
https://media-waterdeep.cursec...hments/2/670/001.jpg
We are at W.
Yester Hill is at Y, only an hour away.
Berez is U, 7 hours away, a 2 hour detour to Vallaki could be made, if wine delivering is still important to you.