So we will be taking a trip down South in a few weeks and my 7month old son is exclusively formula fed.

The traveling time is about 9-10hrs until we will get to the resort, and probably longer on our way back home.

I've never been away from home for so long with my son and am kind of nervous. We usually prepare formula in a large batch and keep it in the fridge. That's what I think we will do once we get to the resort too, but on the two travel days I'm not sure...

If I do prepare a large batch, how do we keep it cold (through customs and a plane ride)? Then how do I warm it up to feed him?