R.E.
Could she bring a small can of powdered formula and some empty bottles and buy the water in there. Once it becomes room temperature, I'd think it'd be ok to use to make the bottle and no heating would be required. She could bring a baby bottle or two of just plain water premeasured to what she'd need for a couple bottles and if they said anything, pour it out and then you wouldn't have wasted the expensive formula. I haven't flown with an infant since this restrictions have been in place, but I did when my son was that age back in 2002. I had the premeasured water in the bottles and a container of formula. It was the easiest way since you couldn't refrigerate or heat up the premade bottles. I bought one of those smaller cans of powdered formula and mixed on the plane. It seemed the best to me since I've heard to have enough stuff for an entire day because you never know about delays or other hold ups. Better to have too much than not enough. I don't know if this is allowed, and it's quite pricy, but maybe the ready to eat stuff in the can?