Ok here is what I do

For beer: Do not eat like 6-8 hours before drinking, don't drink anything either. Just go for an empty hungry stomach and drink that beer.
Sometimes I puke from drinking beer just because the tank gets full and honestly it happens to everyone (unless you are a pussy) if that happens the con is that alcohol you puked didn't get into your bloodstream but the plus is you can drink more.

With liquor:
Shots: Do em quick, down the hatch open up your throat and hope for the best. Do a few in a row take it easy and repeat. I find doing like 4 shots in a row every hour lets say is easier than doing a shot every 15 minutes.

Mixed Drinks: ICE ICE ICE, do not do like 2 shots fill the glass with pop and then put in an ice cube. Fill the glass full with ice pour in the shots then fill with pop etc. A lot of people puke from mixed drinks because there stomach is filled with some much pop/sugary mixer.


And of course practice makes perfect.