Did your Dr. put you on a pre-op diet? I was drinking muscle milk light before the surgery and my Dr. said that was fine for afterwards. 48 hours after your surgery, you can only have clear liquids, Make sure you have soup broth, unsweetened juice, watet and sf popsicles. My paper work says I can have unlimited, coffee, water, crystal light and tea. So for I've only had broth, water, a few sips of apple juice and one SF popsicle. I can't drink more than 3 oz at a time. I just had my surgery yesterday (7/2) and my whole body is aching - so don't forget to take your pain meds -even through the night.