Dog's don't need special water, I don't know what gerberpure water is but it's possible that is what is affecting her urine color. I guarantee you, regular tap water or if you don't trust your tape water, bottled or filtered water is fine for dogs.
Healthy dogs will regulate their own drinking and water intake. If she has no health concerns or meds, just have fresh clean water available at all times and she will drink what she needs to. Only be concerned if you see blood in the urine, or it she is drinking and urinating excessively as you probably know from diabetes, or producing little to no urine and the color is brown or clear or seems thick or sandy. Other than that, i wouldn't worry about it.