How do I know I am drinking enough?
Check the colour of your urine. Pale straw is good. Dark means drink more. Clear all day may mean you are overdoing it.
What is the easiest habit?
Tie water to things you already do. A glass with each meal and a bottle at your desk covers most of it.
Does coffee count?
Yes, for most people, in normal amounts.
Coaching, not medical advice. Read the health notice.