I'm 3 months post surgery and I am just starting to tolerate plain water. I had to add a little something to my water. The things I used was diet cranberry juice, propel, vitamin water, Bai 5, sobe water, G2. Just make sure they are low calorie or sugar free. My early fatigue was from not enough protein and water. It got better. Using my food journal was helpful and necessary. Best of luck