He outlines his game plan on his blog:
So I bought three beers at a time, and poured each 12-ounce bottle or can into a 36-ounce water jug. Holding the jug while I run, I can keep that fucker pretty steady — far more so than water bottles strapped on to my belt.
I studied the course map in detail to plot each beer stop, which is critical because miles 5-10 are on the Golden Gate Bridge and its on-ramps. Christ fucking knows there’s no liquor stores on that bridge.
Before attempting this stupid feat, people told him there was no way he'd survive let alone finish. He proved them wrong, finishing in 5 hours but not before vomiting three times and blacking out during the eleventh and twelfth miles. As amazingly idiotic as this stunt was, I have to say that I'm impressed.
You can read his entire story here: http://exercisingwhileintoxicated.wordpress.com/