we didn't have to open the rest. Could you perhaps put yoghurt in sealed containers so you can just taste some and then pop the lid back on? As for entertaining, I can't remember what we did with our 2, lord knows how I have forgotten as they have both been abroad each year since they were born!!!! Now is is psp's ds's etc, book, crayons etc are always good things to have, I know some people who take portable DVD players for the flight.
). They weren't interested in checking the large cup of water I also carried for Jasmine....On the way back from Austria they didn't ask me to taste anything 
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