Regarding the boiled water, I would only take 2 bottles with water in them. I made sure I had spare sterilised bottles that were empty and asked the staff on the airline or at the cafes to fill them with hot water. Only the cafes at Melbourne Airport refused as they have a policy not to do it in case the baby was given the boiling water by mistake. However, they were happy to fill it with cold water and every cafe supposedly has a bottle warmer which they let you heat to whatever temperature you like. I explained that the hot water was for the next feed, not this one. By the time the next feed came around, because they were in an insulated bag, they were just the right temperature for drinking. If they were still too warm, I just added cold water that I bought.

However, most airlines are quite understanding. Just contact the airlines customer service and ask them if there are any restrictions.