I try to avoid bottled water in plastic, because chemicals leach out of the plastic very easily, particularly in hot weather and sunlight. One study analysed some water prior to it being bottled and it was clean, after ~1 month bottling the water contained 1 mg/L antimony, and I would say, a lot of other plastic compounds. If you buy water, make sure it comes in glass. Personally, I like San Pellegrino because of the high Ca and Mg content, but I'm sure there are others that are good and come in glass.