This is non-sense, I mean.
In the original, if you want "In Water" ending, You need to be between 75-50% health in game, ignoring Maria, looking Angela's Knife sometimes, read the note on the roof of the hospital, listening the doctor tape at the end of the hotel and listening Mary at final corridor.
For Maria, you need to respond or check sometimes Maria and protect her, also ignoring the letter or knife, the audio tape or the Mary audio in the final corridor.
And for Rebirth, you needed some extra object in the appartement, Historical Societal or Hotel and only avalaible on NG+.
I don't know how they do for the remake, but this is more disapointing if all ending can be unlocked with just one choice.