The basic principle is that the person should look for Mubah (permissible) job, for lawfulness and unlawfulness of earning depends upon the lawfulness and unlawfulness of the job. If the job is bad, then it will yields ill-gotten money. Allah has urged eating what is lawful. He (Exalted be He) says,
O you who believe (in the Oneness of Allâh - Islâmic Monotheism)! Eat of the lawful things that We have provided you with
The Prophet (peace be upon him) said,
Allah is Pure and, therefore, accepts only that which is pure.
The person should seek a means of lawful earning as much as possible, thereupon, your job as
the driver of a car that carries Khamr is impermissible. You should quit it and look for another Mubah (permissible) job.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.