Hi, I also recently completed my Accutane course. I'm clear as can be...except for sometimes few tiny little ones, same as yours probably but nothing compared to the nightmare before.
Anyways...I used Cetaphil gentle skin cleanser while on Accutane and still use it now, a few months after. It works great and will not harm your skin. I'm actually surprised you only used water, you would think there would still be alot of dirt and oil on your face after splashing it with water. Hope that helps!