You were fine with drinking from the bottled water, right? No cramping, diarrhea or fever for the past week or since you've been using that particular brand of bottled water? Has there been a recall on the water? I'd hate to make accusations, especially as I don't know you or your breeder, but I would suspect it's either her contaminated well-water passing the bacteria or one of her pups anyway. Some people would hate to admit to the mistake being from their end, and I'm sure she doesn't want you requesting compensation or a refund or overreacting and so forth.
Luckily, your little one has gotten her treatment.
Glad you got it checked out.
As for water, I think either would do. If it would make you feel better, feed her tap, as I'm sure it'll make your breeder feel better about it since she insists that's the cause.
Here are older threads addressing the same ailment your pup has:
http://www.yorkietalk.com/forums/my-...ate-feliz.html and also
http://www.yorkietalk.com/forums/gen...ng-around.html.