My hydration trick for early post-op days:
My husband took 8 8 ounce water bottles and labeled them with 8AM, 10AM, 12PM, 2PM, 4PM, 6PM, 8PM, 10PM. Then he filled them with different things- Crystal Light, G2, water with lemon. I knew I had to finish each one by the time labeled on the bottle, but I wasn't faced with the entire 64 ounces in one container which was overwhelming to me. For some reason, psychologically it really helped me to have the bottles individually and have them all ready at the beginning of each day.