Don't tell her

"You said it yourself, it's getting hot in here. I just wanted some water" You decide to not tell her about the note for two reasons. The first was: a Grail with the power to swap bodies? Really? It's ludicrous. She would never believe you. Even if you showed her the note, she would probably think you were the one who had written it. So there was no reason to tell her and make a fool out of yourself when nothing happened.

The second reason, on the other hand, was much different from the first. What if the note was telling the truth and the Grail was magical? Then she would probably take it from you, deeming it to be too dangerous for you. And you didn't want that to happen. If it was really magical, then you wanted it all for yourself. You could do so much with such a power...

After hearing your answer Janna arches a brow, not convinced. " Why not drink by the bottle then?" she says, pointing to the bottle of water you've returned to the box with one of her manicured fingers.

You stare at her finger red nail and think. She's got you. What can you say to turn this situation around? Nothing comes to mind, you're not a good conversationalist. So you do what you do whenever you don't know what to say: you shrug.

Your mother, for her part, shakes her, not believing you. Then she snatches the Grail from your hand and, under your astonished eyes, takes a sip out of it.