Water

Does anyone else have a hard time getting all the required water in everyday?  I know I'm suppose to drink at least 36 oz everyday.  Before surgery, this was never an issue, because I could guzzle a bottle in two minutes.  Obviously I can't do that anymore.  I sip throughout the day and try to also drink when I get a little hungry, but know I really don't need to eat.  Yesterday I barely got in one bottle, but now today, I'm almost done with one bottle.  So frustrating! Kendra