what were they drinking from those long bottles?

Beer

They were drinking 40 ounces of malt liquor, better known as "forties." I believe Doughboy drinks a brand called St. Ides throughout the film.

Same thing Dr. Evil was drinking when he was romancing Frau Nazi in "The Spy Who Shagged Me." One for me... one for my homies...

Probably Mad Dog 20/20.