Pertaining to Chanyeol's water bottle: At the beginning it was a symbol of Chanyeol's life going down the drain, when Suho tripped over it and hurt himself. However, it also just so happened to be the one Yeonhee grabbed from the fridge when she and Chanyeol reunited for the first time, and at the end, it was handed to her by D.O. It can be interpreted as a sign of Chanyeol and D.O. both having found closure on the events that occurred and then some.
