Invigorating Sourness

Exploration Stage: Italian Patio
From: Juliette
Description: I hope you didn’t believe this lie! The Mistress may treat me badly, but I wouldn’t poison her! All her food was fresh. For example, that wonderful Lemonade. Can you find it?
Completed: This Lemonade looks like it’s just been squeezed out of fresh lemons, how can it be poisoned?! Although a few days ago it looked the same. Is that even possible?