I didn't formula feed Chloe at all so have no idea

however if you take the tins of formula which I have read is suggested then put them in different cases so if you lose one case you don't lose all the formula.
I would also consider taking a good bit extra as the heat may make baby feed more too - a word with the Health visitor might be an idea to see if you can give a little water as it will be so hot?
I would also take nappies - found them to be quite expensive out there but I always used to stock here when they where on offer so paying full price wasn't something I was used to anyway

I used to spread them over the different cases as well.