There is the surge tank, bottom feeder mods, and I've heard of a couple atomizer tanks, but haven't checked into them. I use a bottom feeder, the Reo, which has a 6ml bottle that I squeeze and that pushes
juice through a tube into the bottom of the atomizer. To me it tastes the same as direct dripping, some say it doesn't, but it certainly less messy and less of a hassle and much easier when driving.