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I didn't want to sound negative, sometimes having choices that don't matter are still okay at times usually ideal in repeatable events so players can see all versions of the dialog. I think when choices should matter is when you get a hub screen to choose which character to focus on. so you could do it with how ever many characters you add have daily options to see who you give a drop of the potion to and how often you do for that character to create a diversity of character sizes based on the player's choices.

Don't worry about adding choice too much. Let it come naturally as the story progresses and your ideas flesh out (haha). Keep scope creep in mind. I'd rather have a well-made railroaded experience than twenty paths of which fourteen are WIP stubs and one is unpolished