Hi, anyone out there know of a replacement liquid for the HL Smokers ?

I wish to modify my HL Smoke units and would like to increase their run time BUT I don`t like having to buy the little refill bottles of liquid. I think I read somewhere here a LONG time ago, of other liquids that could be used inplace of the standard liquid from Mato .

I plan on using these smokers in both tanks and in my larger r.c boats and therefore a Generic liquid would be mutch better, if available. I of course wish it to be Safe, Just as good or better, Good price.

Please let me know what could be used and bought Especially here in Canada.

Thanks for Your Help, George