If you want to help an alcoholic then here are some ideas for you to try out. First of all you might consider trying to talk them into going to a rehab center. This can be the best option for a struggling drunk because it gives them the safest place to dry out at and also a good learning experience.
If you want to know how to help an alcoholic then you might also think about organizing an intervention in order to better convince them to go to treatment. This is where you gather all of their friends and family and confront the alcoholic in a loving manner.