I love a cup of fresh ground coffee. But I'm not addicted to it by any stretch... but last week or the week before I was drinking a cup or two in the morning for 4-5 days in a row and wow did I pay for it. Massive headache and brain fog. I think the coffee contributed anyway. seems gone now though, but it took several days to really clear up.

Green tea is ok in moderation with mercury poisoning I think, but don't overdo even that.

I am going to try making (non-alcoholic) ginger beer with honey. Water does bore me after a while.

I have no idea how to get rid of a caffeine addiction. Maybe try decaf for a while. There is a little bit of caffeine in there. I also have some stuff that's called Yerba Mate that has an ok coffee/chocolatey flavor. Doesn't bother me when I drink it but kind of hard to make, you'd have to use a thermos to carry to work.