Many folks can drink again, once they've learned how to control things. That generally means a period of sobriety, though it doesn't always. There are ways to treat the underlying issues while not completely abstaining. Many folks don't get treatment for alcoholism in their early 20's, quit, and drink normally the rest of their life.
Unfortunately, many folks think that once an addict, always one. While this is true for some folks, it certainly isn't true for everyone. You really can be "fit" to drink again.