Booty if you wear the dailie (sp?) contct lenses, as a pax you can take enough spares for the duration of the flight, ie one to two pairs. Is this not the case for crew, I've left my what is acceptable for ground staff list at work. I do recall it includes the phrase "an empty water bottle which you can fill airside." (If your company has had the foresight to provide a water fountain, but how are they supposed to refil it?