I mean to say the water is functional! (I'm not crying).

If the player enters this trigger box, display text. Hide the text when the player is not in the trigger.

Begin with placing the text actor in the scene. Get both the text actor and player camera's local position. Subtract their Vectors and set that result as the actor's rotation. 

Working in a cave has come with some epic strategies. Lighting has been the most important part of my process. It has been a delicate balance of adding small amounts of static lights and baking the map to test the environmental aesthetic and make sure everything is building together evenly. I must say that I think I have started lighting from scratch 3 times! Third times the charm though.