I'm pretty sure everyone will have an answer they are pretty sure of when they read the title of the post. Some might say that drinking a sports drink (Gatorade, Powerade, Isostar, etc) may be the best, others will say that a protein shake/smoothie (natural ingredients or not) may be improved choice, whereas other answers will definitely rise such as water, specific juices, milk or soy milk, or whatever else.
Then again you will have people that say forget drinks altogether, since they are mainly "empty carbs" that provide a reasonable amount of protein/salts/hydration but also have a downside of being liquid form = less digesting and absorption of nutrients.
By now you must be thinking: "enough with this intro, just let me know what it is I should be consuming right after a workout!"
So which one is it?
