Tommee Tippee Portable Travel Baby Bottle and Food Warmer, Thermal Insulation, Stainless-Steel Flask with Leak-Proof Lid

this one may work well for this

The Ceres Chiller! You can use the little chamber or the larger one. Fill whichever chamber you don’t fill with milk with ice and water. You can get multiple if you like, I see them on Facebook marketplace too for cheap and they are super easy to clean. https://a.co/d/0iCRYENK The Tommee Tippee bottle warmer on the go if you need to warm the bottle up. It’s just a thermos that you can fill with boiling water at home before you leave (TSA is fine with this) or you can get hot water while traveling). Takes 3-5 minutes to bring the bottle to temp from the chiller. https://a.co/d/02zUKkVl Id also recommend pump/bottle wipes. They are just great to throw in diaper and pump bags to use in a pinch. https://a.co/d/0jebXGdi In case no one told you your pumping bag and the diaper bag won’t count against you for carry on limits either. You can check your car seat for free if needed. If you need a travel stroller that fits in the overhead bin the Mamazing one is incredible. We mainly used it and it was honestly a luggage cart for us with the carry on bags, diaper bag, and put pumping bag and we baby wore our little one. We did actually use it at our destination too and it was super easy. https://a.co/d/03MW86Iq

Electric kettle or boil water and store in this https://a.co/d/03buY7Wr if your baby only takes warm bottles then invest in something better but for $14 got the job done for us

Best purchase we made https://www.amazon.com.au/Tommee-Tippee-Travel-Bottle-Warmer/dp/B004I110D8/ref=asc_df_B004I110D8 And you can continue to use it as they get older to heat up food.