I used to take 2 bottles in insulated bottle bags, one hot and one cold. Then if the hot one was too hot I'd add the cold water until it was the right temp and then add the formula. It worked really well. Most of the time the hot water bottle would be right on perfect by the time I had to feed him anyway. If he needed 2 feeds I would heat the cold water in the microwave, then add the formula.
Eta, formula dispenser was $4, avent bottle bags were $20ish back then.
Not that it really matters as he's 10 months old, but it's better to just make the formula up as needed, ie take/heat water and powder in dispenser as people have suggested to avoid risk of bacteria growing in nice warm milk if left made up for too long. (I think it's recommend to use made up formula within 2 hours).
As people have said avent milk dispensers are good, or if you use tommee tippee bottles you can get small containers that fit inside bottle even once filled with water. Great for saving space.
We fill DDs bottle up to 180mL then add the extra 60mL of boiling water as we need it. Its sooo much easier
I agree with warming the water first and adding formula powder when you're ready to feed. I either used boiling water mixed with the cooled water so that it's warm and use a b-box bottle that has a container for the powder attached or just use a separate formula container. They also sell portable bottle warmers - the one I have is a gel pack that has a metal disk. When you bend the disk, the gel heats up. It's magic!
I always took a bottle part way full with cool water, formula dispenser and got hot water from a cafe etc
If we werent going near a cafe i used a small thermos (drink bottle size)
I only use a micro if babies are screaming lol otherwise i sit the bottle in boiled water while i change bub. I cant wait till i get them only room temp but its too cold overnight at the moment.
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