Puppies drink a lot. They pee a lot. That's part of being a puppy. You shouldn't have to "give"her water -- she should ALWAYS have fresh water available. Perhaps she is drinking a lot at one time because she doesn't always have it!
You should also NOT be tying up a puppy! It is not a "punishment". She isn't human and does not associate being tied up to being bad. If you have issues with where she goes, crate her when you can't supervise.
I don't think your pup is sick, but it sure sounds like the poor thing has an irresponsible owner! A responsible owner, who has concerns on whether the dog is sick, would TAKE IT TO THE VET!