In what circumstances does or would your character drink alcohol? (e.g. "with a meal, for fun, when depressed, at any excuse, NEVER EVER")
Socially, with meals, and probably alone (in his bedroom so Ellie wouldn't know) to kill the pain of how badly the Intersect was ruining his life.
How much would they normally consume? Do they get drunk every once in a while, or live and breathe alcohol, or make sure to stay under the legal limit?
Usually, Chuck would keep it to a drink or two, to loosen up and/or have fun over dinner. Once in a great, great while, get really drunk.
How much alcohol tolerance do they have? Does even a sniff of alcohol knock them over, or can they guzzle alcohol without feeling impaired?
High-ish. Would probably be okay with two, depending on what they were; three would be a buzz, four or more would cause motor function impairment.
What kind of drunk is your character? How would they act if they were drunk?
Silly and even dorkier than usual. Though, with the right topic, he'd get upset/sad. Chances of him being an angry or violent drunk are very low.
Who would they go drinking with if they had to choose drinking buddies?
Kitty! Faith! Spike! Logan! And anyone else who wanted to come!
What's their alcohol preferences? Beer, wine, mixed drinks with fancy names?
Canonically, he's done them all. Though he seems to prefer wine with meals, beer or cocktails socially.
Green alcohol y/n?
Sure, he's not Irish, but that would be fine!
Your character is completely drunk. Who do they drunk-dial, and what do they say?
... he already did this. He asked geeky questions and told a corny joke. XD