Is it safe to drink old 40's?

Hi, on new years eve i had bought a few 40's for me and my friend, and my friend wasnt able to finish his second one, and i stopped my second one because of him. I put the cap back on both before I went to bad, they were both about halfway depleted. I don't want these to go to waste, ive had them outside in the cold. I don't remember the exact kind of 40, but it was a malt-liquor beverage. For those unfamiliar with the term "40" it means a 40-ouncer, usually of beer or malt-liqour. Is it safe to consume these, I do not want these to go to waste. I know it won't taste good, like old opened soda, but is it actually safe to drink? It is similar to a "hurricane" and tastes almost the same. And one more question; does malt-liquor freeze, and if so, what is the best process to defrost them? Thank you :)