Opal gave you good advice.
I flew with my (then) 7 month old x-country and
found it worked well coming/going to try and time
his feedings for takeoff and landing.
This way he really wanted to latch on and suck
the bottle while the plane was experiencing
the change in pressure.
You definitely want to take more than 2 bottles, tho.
Delays happen, especially with having more security.
And I hate to say it, but in the event and aftermath of an emergency you don't want to be searching for something to feed your baby!
FYI, if you want the bottles warmed sometimes the flight attendants can help you warm it.
Even bringing you a cup of hot water would do the job.
(But obviously not while they're super busy!)
Happy landings!