What most of you gigging muso's don't seem to realise is, that at a gig you are supplying a service, and no way should you be under any influences, booze etc!
You are getting paid to perform! So even at rehearsals, to make your next gig work you should use this time as a real gig and keep it real!
Any sort of 'extra help' should be avoided! Any singers, don't touch alcohol, ruins the vocal cords (as does ice in your drink)!
Do it properly, and then you'll see the results!