First flight with 6 months old

Hi mums, how are you? In a little over two weeks, my 6-month-old baby girl will face her first flight. It may sound silly but I am very anxious and would love to hear tips and tricks from those who have already been through it. My little one is on formula milk and I was wondering how that works for the plane too? Unfortunately she doesn't drink it cold so I'd have to arrange to have it warmed up. Is it worth buying a portable electric bottle warmer ? I'm a bit worried that she rarely falls asleep when we are out and about which leads to her being very tired and then everything that goes with that. Fortunately the flight is around two hours and I'm flying Ryanair. Thanks in advance for anyone who replies Kisses