Thanks solary. I see your point. I do few business trips per month as well, although I always do have someone staying at home, so I think after giving instructions how to change water in humidifier I should be sweet.
But while I'm on it, do you use distilled water? I'm hearing that those humidifiers should use distilled water. Although cheap to buy, the quantities will add up rather quickly over several months and may present a bit of logistic problem down the track.