So I've tried multiple things like turning off save on travel, etc, but everytime I try to enter the inner sanctum after getting the water from the shrines my game just freezes, tried enetring as human or vampire and it's the same result. I've tried reloading previous save points but it's the same, what can I do?

This was happening to me earlier today. I fixed it by fast-traveling away and coming back, and then I was able to load into the Inner Sanctum.

Thanks man it worked. =)