How can you last longer drinking beer liquor or any type of alcohol?

There are three ways, one of which is not recommended.
1) Drink slower, or drink more diluted cocktails. Or, stop when you start to get buzzed, sober up a bit and then start again.
2) Eat beforehand. The common reason is to "let the food soak up the alcohol." The stupidity of such a statement aside, what this actually does is cause alcohol to be absorbed slower, since your stomach is busy processing food as well.
3) Not recommended: increase your tolerance. The only way to do this is drink more frequently or, in line with suggestion 2, gain weight. Neither option is healthy or smart. Which leads me to option #4: Why do you want to last longer? It's better for your body, mind and wallet to drink less. Hell, I wish I was a lightweight - I have a friend who never spends more than $10 at the bar, when I'm spending $40-80. It's a REAL drain.