Alcohol dehydrates you extremely quickly, so it's imported to drink a lot of water. The one glass water to one glass alcohol is a good rule, I always try to drink the same amount of water as alcohol if I am going to drink a bit more than the odd sip here and there.
Just bare in mind - when you get drunk, most people get very loose. Both loose lipped and loose with their body. I have seen young girls (18 is the legal drinking age in Australia) walking off with revolting 40 year old men, vomiting all over the street, boobs hanging out of their top and underwear half off.
Not to mention the people I've been out with who have been shooting their mouths off about all kinds of things that they would NEVER have revealed if alcohol wasn't in the equation, and who I'm sure would have deeply regretted having spilled what they did.
Alcohol is a very ugly drug, drink it in moderation if you like the taste but please don't drink just because other people do.
As a kid, my dad was a Paramedic and would frequently come home with the stories of drunken kids he had to scrape off the street. Girls suffocating on their own vomit, needing it sucked out of their mouths, clothes soaked in their own vomit, urine and faeces lying in transportable hospital beds, in public hospital corridors screaming and crying pulling their clothes off.
Then there's the effect of the latest craze of having energy drinks with alcohol.
Bad bad bad bad very bad. Alcohol is a depressant, energy drinks are a stimulant. The energy drinks make you feel like you're not drunk, so you drink more and more until the alcohol takes full effect. So many people end up passing out very rapidly, and people have died as a result of these drinks.
Playing big bad mother figure here, but just be careful ;)