So i've been seeing pictures of peoples "box-mod" looking setups but its saying they are "bottom fed" and i see like a tank or like a bottle or something at the bottom of the mod. How the hell do you do this? How does it work? Can you buy these pre-made??? I love to drip and i use a nemmy/3d setup and that seems to work well for me but to not have to actually drip but still be able to use a dripper would seem to be nothing short of amazing. Does anyone have anything to fill in the blanks for me on this one????