I mostly just drink water. I stopped drinking soda in 2000 as part of my preparation to get pregnant and never regained interest in it. (I drank Dr. Pepper as a preteen and Coke -- loved cherry Coke -- as a teenager.) I used to be a big juice drinker but in the last decade that gradually and irregularly declined. In the last couple years, the only time I've drunk juice is when there was no fruit as an option in a restaurant. I do still love lemonade but haven't bothered to make it myself and I'm very particular (fresh squeezed!) so I haven't had much of it in recent years. I've never been a coffee drinker and never drank tea until my midwife urged me to in 2006. Since then, I've had it very irregularly and occasionally. In the last year I've been having something called Peppermint Cozy Chai (I believe generically it would be called a mocha chai?) from my favorite cafe, where my favorite drink is called Heartbeet. The Peppermint Cozy Chai is probably self explanatory. The Heartbeet is milk (I always choose soy), beet juice, a sweetener (default is honey but I like to get maple syrup instead), and cinnamon. Offered either hot or cold, I actually enjoy the cold more. Although the hot is prettier because it's frothy and they make a pretty design on top and sprinkle it with cinnamon.
But yes, water is the only regular thing I drink. I carry a 28 oz water bottle with me wherever I go and drink tap water from my house that goes through a little countertop water filter. My current water bottle is a metal one with the plastic "chug" lid from Simple Modern. I dislike the straw models and the flip top models because they're harder to clean. I'm thinking of even switching from the chug lid to their simple screw lid because my newest chug lid is light green and sometimes I find little pieces of black in the spout from the rubber gasket or whatever it's called that prevents leaks.