One other option

The KC Dawn Petrol used windshield washer reservoirs and their pumps from old cars for the smoke systems in their Nieuport replicas. Here?s the link: http://www.kcdawnpatrol.org/smoke.htm.

I've always wondered if there isn't a reservoir that would fit on the left side of my firewall.
 
In the smoke system that I made I used an outboard motor 2 cycle oil tank, facet fuel pump all installed in the baggage area and run the line up the channel.
I had a stainless #4 an fitting welded to the exhaust system. One master switch to supply power to the system and a push button on the joystick. Made lots of smoke.
 
They guys that sell the SkyBolt plans also have all the components for a Smoke kit... Steen Aero I believe.