soda, were I single, I would be on the plane to meet you, and apply for the “rebound” relationship, at this very moment. (OK, waiting for the grammar corrections…)
If you feel anything for your ex, it should be pity - the dope let you go, and he’ll never find another like you. He should have fought for you against all the forces tearing you apart, and worshipped the ground you walk on. That poor slob will never know true happiness, and you will most certainly find a more deserving, more handsome, more virile mate in no time.
As for coctail of choice, I used to like Vodka Tonic, but from today on I’ll have soda.