Well, there are two very common methods of kicking an addiction. The first being cold turkey which means just stop, completely. Your going to hate it and want to have some and probably be a real asshole to everyone for at least a few days prolly closer to a week or more. However that is technically the quickest and easiest because it requires very little thought, money and all you have to do is not drink the caffeine. The second option is to ween yourself off. If your having 3 energy drinks a day start drinking 2 a day, then after a few days have like 1 energy drink and one caffeine soda, then after a few days 2 sodas, then maybe a soda and a cup of tea ( or something similar with less caffeine) then maybe just a couple cups of tea after a few more days, then switch to something like caffeine free soda, get the taste but not the caffeine, then finally just stop. It'll take longer and cost more, and you'll have to control how much you have, but it won't be a violent of a drop in caffeine.