Unless you have such extremely hard water and are trying to achieve special conditions for spawning on some sensitive fish, I do not feel you should use any bottled water.
Most of them have been so filtered for taste, they remove many of the solids in water. These solids are what you will need to help your tank maintain it's pH (buffering capability).
What are pH, ammonia, nitrites, nitrates, GH/KH on your tap water? The pH should be done on a sample that has set out over night in a shallow dish.