People are usually surprised when they find out how much I drink. Puerto Rico is famous for its rum so it's cheap here at $3 a bottle. It's readily available and I tend to treat myself to rum & Coca Cola at least one night a week. It's my favorite drink! Go simple + inexpensive options!
There is also a famous drink here called 'Gasolina' which comes ready mixed in this juice pouch like Capri Sun. It is delicious and tastes like fruit juice, making it extremely dangerous as you barely taste the alcohol... you can drink way too many before you know it. To top everything off, each one is about $1 so it's $10 for a box of 10. I believe this is only sold here. It might be because I am of such small stature, but just 3 of these will get me wasted.
www.gasolinadrink.com
I am legal drinking age now at 18 (USA legal age = 21, Puerto Rico = 18) but I have been drinking since I was 13.