Using bottled water as the main drinking supply to the house can be very costly. (in some instances, litre per litre, branded bottled water can be as expensive as petrol). Unlike drinking spring water, buying bottled water is not very environmentally friendly. On the whole, filtered spring water will taste better than bottled water. In part this is due to spring water being well aerated (contains elevated levels of oxygen) and a low pH adds a natural sweetness to water.