Bottled water is SOLD onboard....it is not complimentary. You be able to buy it at any bar and they usually have tables set up by the gangway when you disembark for any excursions. The brand they sell is Dasani.....used to be Zephyrhills but they changed. I believe the cost is either $1.50 or $2.50 per bottle. I can't remember. You can certainly bring your own onboard. We usually bring a six-pack of bottled water and then keep refilling the bottles from the water station up on Deck 9 that has delicious water.
MJ