I take tge formula anf get water from steward
Remember that there is a 100ml limit on bottles, so don't make up any more than that, otherwise it won't get through security
You can put your baby formulae in your luggage as much as you want or can and check it in. For the travel to just feed your baby from initial to the destination just a container is enough in your back pack. If you don't wanna see the formula thrown into a trash container.
Look up the TSA website.
As much as you want, just don't mix it with water before you go through security.
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