1) Before you attempt to deal with a 'caffeine addiction', look at whether you have sugar addiction - which is far more dangerous for your health and more complicated to address.
2) Many of us don't get the amount of sleep we really need to function. Unless you sort that problem out first, you will just end up feeling sluggish and unproductive without the caffeine.
Do you have any relevant articles on addressing sugar addiction? I'm not sure any grand strategies besides cold turkey.
Likewise I mix my on soft-drinks from cordial + soda water (seltzer) and i've scaled it back to the point where I often prefer the water plain.
The great thing about it is I use the sugar as a hit for its own sake now if I'm feeling tired/whatever. It doesn't last long, but it can be a great way to get yourself going.
There's really no way to do it other than cold turkey, but similarly to kicking morphine for heroin after the civil war, it's easiest to do cold turkey by replacing with something better. :)
I used to put 4 teaspoons of sugar in my tea, it just wouldn't taste right without it. Then I decided to cut down. So I started reducing it in very gradual steps. 6 months down the road, I was down to 1.5 teaspoons.