This is like the normal game, but i have a drinking problem and i dont like pissing myself, so this is how we do it in montana. 
 
you can use one arm, or if u want, 2, and u can leave a hand free so u can piss 
 
but anyway u just keep adding on the bottles as you run out, DONT TAKE OFF THE EMPTYS!!, and this game works for any size or type of bottles, (try normal 12oz. long necks) but anyway, by the end of the night it can get pretty hilarious 
 
p.s. Be carefull about falling over, trust me…
(Thanks John)