I'm thinking of spending nine dollars on alcohol
What's your reasoning for spending nine dollars on alcohol?
A good drink will lighten my mood a bit
It sounds like you're only having a few drinks, which is fine.  You don't want to drink too much, as that can be both unhealthy and unpleasant to deal with.  I hope you have a good time!
9 buck well spent.
Responsibly having a drink or two is usually a good time and can relax you a bit. Just be safe and enjoy yourself!