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Something like this will do http://www.ebay.co.uk/itm/1pc-Brand-New-Mini-Brushless-Motor-Submersible-Water-Pump-DC-12V-3M-240L-H-/151319200392?pt=LH_DefaultDomain_3&hash=item233b53c288 put inside a...

im just using a cheap £15-£20 pond pump submerged in the water tank.get the correct clear water hose that fits the two unions on top of the spindle that came with it, run these two to your water...