Saw a cool thing at ORD last week. They have a sink/disposal unit sitting next to the trash can at the checkpoints. They have signs advising you to empty your water bottles before the checkpoint, save them, and refill them later. Several of the water fountains at ORD are also designated "bottle fill stations" and have faucets that are specifically designed to make it easy to refill a bottle with water.

It's stupid they had to do that, but it is an incredible convenience, assuming the liquids policy is here to stay.