a) A pouch of Drum lasts me about two days. For some reason I think rolling my own is healthier. Otherwise it's American Spirits.
b) As Cynical said, take a look at my avatar, or read some of my posts A 1.75 liter lasts me anywhere from 2-5 days depending on my stress level.
c) Working on the junk food, but with the calories from the liq, I usually only eat at work. Stoffer's lasagna is pretty damn good. Ramen and grilled cheese at home mostly.

Yup, I'm not healthy at all.