Originally Posted by green_rd
The water on the lido deck is colder. If you fill from there you can add some ice. Please use a cup to fill your bottle though.
But don't fill from the pool which is on the lido deck.
We always ask our room steward to keep ice water in the cabin at all times and I bring 2 empty water bottles with us. Also have water bottle holders with a strap I carry around my neck (to keep hands free) for when we leave the ship.