you must mean cognac
Do as much preparation as you can.
If the presenation is on George Washington...make sure you know everything and anything about the guy, his life, his likes, his dislikes, his family, where he lived, where he grew up , what he did, why he did it, his family, his friends, his enemies, his parents, his siblings, his cousins, his death, the generations before and after him.
Also find distractions. Print brochures or documents. Make use of audio/video/ other presentation materials. If you get the audience looking at something, feeling something, then the pressure is off of you.
Find a way to make fun of yourself and of the topic.. If you lighten a crowd up, sometimes it lightens the whole mood up. People won't feel the need to think, "here we go again" or "this sucks." If people are at ease and lightened up from the start, sometimes it makes it easier for everybody involved.
Look around and think of different thoughts.... If you have to think of everybody being naked, then do that.. Not sure why that was ever advice given in the past, never worked for me, but if it works for you, then use it.
Move around.. Don't move around too much, but move around enough to not look like a log.
For me, if I know everything I could possible find out about my subject or presentation, whatever or whomever it's on, it sort of calms the nerves a little.
For me, presentations were never the real problem... yeah maybe I needed to practice changing the pitch of my voice and so on, but for me it was always when people asked me questions where I had to defend what I said..... that always caused me problems.
Watch Steve Jobs.. One of the best presentation givers I think.. Heck, listen to Bill Clinton give speeches. They were almost masters at the way to give speeches and talk. Learn from the best.. You don't have to be a genius to give great speeches. You just have to offer something the crowd doesn't already know or think of.
Remember you are presenting to a crowd. Remember who your crowd and audience is.. If it's a bunch of people at a funeral you aren't going to say certain things, but if your at a wedding, you'll say other things.
Always remember who your audience is, it makes it easier in the end.
And always have a surprise or two and an out.. Maybe you get stuck on one topic, just make sure you have a way out if you do get stuck.
Best of all, just take a few deep breaths and relax... It'll all be over in less than 30 minutes anyway.
As far as drinking... It will only lead to major problems down the road.
Cause 2 shots and some cognac now will mean 6 shots and more cognac in the future. It'll mean one day you won' t be able to give a speech or talk because you didn't have that drink. It'll become a crutch.. A crutch you sure don't need.
I've succeeded staying up till 1:00 but the next day I became all energetic again thanks to the adrenalin.