Good Will Riker wrote:
Also, what was that stuff that Mathis poured into Bond's water cup in Casino Royale if it wasn't poison?
Booze I presume - it was the girl in Le Chiffre's entourage who poisoned Bond's martini
When Bond is at the hospital and talking to Mathis, Mathis pours some powder into a glass of water. But since Bond is recuperating at that point, medicine at a hospital isn't out of the question. And since the movie wants us to think Mathis is the villain, the scene has a sinister flavor to it. At the end M says Mathis wasn't involved, but Bond doesn't believe it. But it's clear that Mathis was on Bond's side all along. QoS
only reiterates that.