[Mamoru's thoughts definitely go into "Human body is made 70% of water", but he doesn't say anything about it out loud. It's scary enough a thought as is. Maybe one day they can discuss that, but today is not that day.]

Having healed with water for so long, it's no wonder you tend to forget. I'm sure with time, you'll be able to adjust to it enough to make it a routine - without forgetting how you do it at home.