Distilled water cant support life because it is too pure, bottled spring water is ok, but its a good idea to get the fish used to your tap water, as this is what you will be using for water changes. The PH, hardness and other parameters should not change drastically from water change to water change. If I were starting over, I would age some water in a large clean container, maybe with some carbon in and a pump or airstone to keep it circluating. If the tap water is chlorinated, it will evaporate after48 hours, Chloramines on the other hand will need to be removed chemically with a good water conditioner.
Ken