Toyota hilux utes have small washer bottles ive been eyeing one up in work for a while now they only have single solenoid though.
Or you could buy a little solenoid for pumping water and stick the tube into a 1 ltr water bottle or a beer can or whatever you want.
There doesnt seem to be a company that makes twin headlight kits for the R, if there is they arent doing very well at promoting them.