I want to install this on a window i have in my shower. The water will not hit the window but the windows steam up and there may be some splashing but not a lot. How will this product hold up?

Since this is a fabric film that has an easily removable backside, similar toa static cling, it might not be the best in that humid situation. You might consider one of the linen look films: https://www.decorativefilm.com/product-search?Search=linen. One other note, the Squid films are not as private at night when the lights are on inside and it's dark outside (if that matters).