Operant Conditioning Vs Classical Conditioning

I have a roommate who has bad drinking habit. Whenever he has free time, he spends his time with his friends and stays up late drinking. Sometimes he comes to the room with booze and he pees on the floor. I am helping him to avoid his bad habit by using classical and operant conditioning methods.
In classical conditioning, the conditioned stimulus is not simply connected to the unconditioned response; the conditioned response usually differs in some way from the unconditioned response. For example, while my roommate starts drinking he gets sick after few days, and I have to remind him to stop drinking because it’s bad for his health, and wherever he looks at the bottle of booze, he will feel sick. The unconditional stimulus is my roommate drinks; the unconditioned response is he gets sick. For my conditioned stimulus, I kick the trash on floor, and the conditioned response is my roommate going to pick it because he likes the room clean and he won’t drink because he’s busy cleaning the room.
For positive reinforcement, every time he doesn’t drink, I will buy food and we’ll watch a movie.
Classical and operant conditioning are both similar because they involve making association between behavior and events in an organism’s environment. The differences between classical and operant conditioning is to focus on whether the behavior is involuntary or voluntary. In operant conditioning, the learner is also rewarded with incentives, while classical conditioning involves no such