It's easy to forget to drink water, you know. Maybe set an alarm throughout the day to remind you.
Yes, coffee can be a pain to wash away. I think it's best to put on a swimsuit and do it outside if you have the privacy. Coffee grounds are good as a fertiliser, so it would help the environment. I'm not sure if it clogs the drain, or if it's just a real pain to wash and tidy the shower after 😆