How Navalny was poisoned by secret agents

The transcript discusses an investigation by Bellingcat into the poisoning of Russian opposition leader Alexei Navalny with a nerve agent called Novichok. CNN obtained records showing the FSB's surveillance of Navalny before his poisoning. A special FSB unit specializing in toxins began trailing him a week prior to the incident. Evidence suggests Navalny was poisoned the night before he fell ill, possibly through contaminated hotel items.

What did Navalny remember about the drink he had before falling ill?

How might the poison have been administered to Navalny?