As everyone has said...you're right on track! Don't think numbers when it comes to weight loss. Everyone is unique in their own weight loss journey. Concentrate on the small goals-like fitting into a pair of slacks that you couldn't get on before, etc. That's a fine way of 'seeing' your progress. Leave the numbers to your followup doctor visits or maybe once a month!
As for the 64 oz of fluids...that's very tough in the beginning. Again...like everyone said-your body has had major surgery and you are healing. My doctor gave me little one ounce medicine cups in the hospital. I made sure I drank one of those every 1/2 hour or so. It made it easier and kept me from getting dehydrated. Dehydration is THE BIG THING-so, try that and see if it works for you!
Best of luck !
Celtie 