I used to work with a singer who drank at every rehearsal and gig. He sounded amazing....for about 3 songs. After that it was usually a train wreck.Relaxes the vocal cords dramatically
One of favorite local performers sweared by Grand Marnier to help his singing voice through the night.
Any serious vocal teacher will tell you "no alcohol". I don't drink at rehearsals and gigs normally, and I know I'm not a good enough vocalist to play the bass and sing correctly when I drink. You aren't either. Alcohol makes it much harder to control your vocal cords. They don't need relaxing, they need hydration.
All that said, the key (as everyone else has mentioned) is practice. But set yourself up for success. Pick songs (with easy bass lines) in your range that you know you can sing without straining. Your first job as a singer is to hit the notes. Once you've got that going and built some confidence, you'll be able to take on more challenging material. Success breeds success.
Learning to play and sing was the best thing I ever did for my musical growth. Should have done it a long time ago.
Good luck.
