Alternately, I'd love to see AC work out an approach that doesn't involve the insane consumption of all that plastic. Hugely wasteful, in terms of the plastic, the fuel to carry it, the volume of space it takes up before and after use, etc.
I have a metal bottle (600ml or so) with cap that I travel with, and I try to fill it myself in the lounge (from a new water bottle or even just a faucet - that water is cleaner anyway), and I refill it myself on long-hauls from one of the 1.5L bottles that jarusoba mentioned.
It would be an expense for sure, but I think of it like the headphone issue but much larger. AC is wasting money, and water, and oil, and time, dealing with all that plastic and then just junking it later. Surely we can find some better system.
(I know only some planes have potable water tanks, and they often provide water that tastes awful, so I'm not suggesting that!)