The owners manual says to Only use distilled water in your IC spray tank.     When i bought mine (used) the man had clearly been using tap water as there was a few tiny 'things' in the tank (very small particles, sand?  something?)   i ended up draining it all out and refilling it ,  but if you just filtered some water with like a brita i would ** think** it would be okay.    the standerd button sprays the ic for about 3 seconds.   
   In what autox class is adding or moddifying an IC Sprayer legal ?  (i know its specifically not allowed in SP) (i've been wondering about setting up something automated for mine,   that or just duct taping the button down for my run )