Hey gutsy where you form?
Anyway for the tornado you could get a mega Tank kit. http://www.totallywicked-eliquid.co.uk/products/tornado-tank-ecig/tornado-tank-mega-cylinder-shaped-tank-product.html
and buy http://www.totallywicked-eliquid.co.uk/products/tornado-tank-ecig/mega-tornado-tank-empty-2ml-cartridges-2-product.html
They hold 2ml liquid
or you could get a Dual coil tank which holds 3.5ml or 6ml depending on which you buy. These use their own atomiser called a cartomizer. A metal tube with a packing material that soaks up the liquid. You fill this with liquid then place the cartomizer in the tank and fill the tank with liquid. The liquid in the tank is then soaked into the packing material in the cartomizer through a small hole in the side of the metal tube of the cartomizer.
They are very good if you want to reduce your filling times.
What liquid are you using? Thicker liquids tend not to work as well in the DCT though since it is harder for the liquid to go through the little hole in the cartomizer. you can still use them but might find you need to top up the cartomizer manually form time to time.
besides that there are the clearomizers or smokymizers but they need filling with a syringe kit. Although they do hold a fair bit of liquid themselves.