Many people complain of thirst especially right after surgery. Although unlimited fluid intake is impossible, adequate hydration is not. This will quench your thirst without providing too much fluid at one time.
Some people freeze low calorie drinks in ice cube trays for smaller portion size.
Eat foods that are naturally higher in water content. Fruits and vegetables have a higher water content than most other foods and can help in keeping your body hydrated. Avoid high salt, high fat foods. Not only are these foods bad for you, they also make you thirsty.