I think it matters where your weaknesses are. If you have a family history of heart problems, drink your bottle/day. If you have a family histroy of liver problmes or alcoholism, stick to the glass/day.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .