If you live with an alcoholic, you want to offer love and conversation when they are not drinking. Trying this when they are drinking may be harder to do since you never know what their mood is or how they will react. You have to have an open line of communication even if the person is an alcoholic. You should not try talking about anything important when they are drinking, but engage is light conversation and leave the heavy discussions for when they are sober. Then you can have a friendly conversation. Just show them some love and hope that they like that better than what they get when they drink.
If the alcoholic is not a mean drunk, you can offer love. This of course depends on the mood of the alcoholic when he is drinking. Some alcoholics are mellow drunks, but even the mildest mannered alcoholic can switch moods just like that without warning. It can be like a roller coaster. One minute they can be sweet and loving and the next screaming at you because you said something that they did not like. This is a pattern with most alcoholics. You never know what you can say or do. It can change from day to day or even minute to minute.
When the alcoholic is not drinking, engage in conversation and try to touch on the drinking. This is the only time you have to discuss drinking. In most cases, they will tell you that they do not have a problem. They do not see it the same way that you do. You could point out a few things that they do when they drink and hope that they remember. You can tell them how it makes you feel when they have to drink all the time. It probably will not help them, but it can help you.
Explain that you want to care about them and do not want to see something bad happen. You can pour out your feelings and at least let them know how you feel, but chances are, they will only quick drinking for a few days and then start hiding it from you. This is common with alcoholics. If they know that you do not want them to drink, they will find ways to do it and hide it. It would not be uncommon to find empties in cupboards, down in the basement or out in the garage.
Talk about the future and things you would like to do. Make it clear that you want to enjoy a life with them, but you want them to be around for it. Make it clear that you are not really happy with the ways things are, but you would like to help make a change. Never tell them that they have to change, make it a change for both of you. You may not need to change, but telling them that is not going to mean a thing. You have to tell them that you will change with them.
Explain some of the health risks that you discovered. This may be one thing that could help. If they do not want to die at a young age, they may think about what you have to say. Of course, if they do not feel as if they have a problem, you could be talking to deaf ears. You can still try. Maybe if they see or feel some symptoms, they will think about what you said.
Try not to get upset or yell. Engage in a light conversation and if you feel yourself getting upset, take a moment to collect your thoughts. The last thing the alcoholic wants to do is listen to you yell at them. If you do not walk away and calm down, they might just leave and find somewhere to drink. This will defeat the purpose of your talk. You have to be on eggshells when you live with an alcoholic if you want to help them. You can be caring when you talk, but do not expect that in return from the alcoholic. That may come over time.