That's a good idea for the Trello board, thanks much!
The board now has some High, Med, Low labels.
EDIT: I've got an idea for the hydration meter that came to me as I stared at the all white player prototype I made. What if the hydration meter was the player, something like this...
When the player is fully hydrated they are all blue, then they gradually turn white as they lose water. I was reading about sprite masks in Unity, and wonder if I could use something like that to get this to work.
I know I could do it by creating a series of sprites for each level of hydration (say 10 levels times about ten sprites for the animation stages), but that'd be a slog and not as elegant.