Hi,
I am not sure if this link will be of any help to you - but these are the formula's that are availabale in the US /Canada.
We travelled from the UK to South Africa when our DS was 5 months old for 3 weeks. We did not want to switch brands while we were away, so we took, formula with us.
It was very bulky to pack - we took 3 tins, but it was worth it in the end, and when we came back we had a big amount of space to fill our case with all sorts of goddies
Hope you have a fantastic time.
Paula x