Needn’t get overly complex. She might just find it easier to drink from the glass.
Don’t you find it odd, though, that somebody has a glass of water ‘at the ready’?
Watch the video.
One person handed her a bottle of water. Hillary then looked at another aide who took the of water and handed her a pre-poured glass of clear liquid. Hillary then walked to the front of the plane away from reporters and behind a curtain. She was closely followed by two other aides. She did not attempt to drink anything on camera.