The one thing I know always take is a sharp box as you cannot put them into the house waste. Also take little pads of alcohol wipes too. I went to the states and there in some states they have a machine in the supermarket where you drop all your sharps in but they do charge you for disposing...
Remember your diabetes passport that tells you what you are on, this the diabetic nurse will give you. Take a small sharp container with you. Cary every thing you need with you not in the luggage hold as your insulin will be destroyed. Take a little more than you need. Take some food with you...