[rconti]

It's getting better. SFO, for one, has long-neck water dispensers for filling your own bottle. I've found other airports often have something similar. Of course, you need to think ahead to actually BRING your empty bottle (or dump the water before security), because my first thought when packing is "oh, I can't take my Nalgene because they won't let the water through security". It takes an extra step to say "oh, wait, I can take it through EMPTY".

Of course, it also seems silly to pack a large empty container.

I'm more likely to use a disposable bottle if I'm going to an event, or I'm walking around a city all day as a tourist, and want to be able to ditch the bottle rather than carrying it around empty.

That said, I virtually never buy water, I dislike it on principle and only do so in special circumstances.