Did the hospital give you the little 1 oz cups to drink out of? If so, fill them and try to get in 2 every 15 minutes. If not, get a few shot glasses and line them up, fill them, and try to drink 1-2 every 15 minutes . I know, it sounds crazy, but it works. 8 oz an hour means you'll have 64 oz in 8 hours! This way I was able to hit 64 oz by day 3 post op. Some people drink certain temps better than others, so try warm tea, iced drinks, and room temp to see if it makes a difference for you. My nutritionist suggested drinking out of the little cups and then graduating to an actual cup instead of using a water bottle because we gulp less air when we drink from a cup. I found this to be very true.
I had to flavor my water to get it down post op. The sugar free Jolly Rancher water flavoring packets are my favorite. I had to water them down a good bit, but they helped a lot. I also kept an insulated cup with hot broth in it to sip on. Broth, milk, sugar free popsicles and shakes all count towards your hydration goals!