Google...
http://www.ringthis.com/tv_drinking_...iglebowski.php
The beginning of the movie - Entire cup or beer
Dude smokes pot - 2 drinks
Walter mentions Vietnam - 1 drink
Donny says dude - 1 drink
Someone bowls a strike - 2 drinks
You see George Bush - 5 drinks
Every time Dude drinks a White Russian - 1 drink
Every time the Dude wears Jellies - 2 drinks
Every time a weapon is in the film - 1 drink
Every time Walter says Shomer Shabbas - 1 drink
The Dude rides in a car (not driving) - 1 drink
Every time Flea is in the picture - 1 drink
Song on soundtrack starts - 1 drink
Every time the dude puts on sunglasses - 1 drink
Everytime someone says gold bricker - 2 drinks
End of movie - Finish what is left