Formula feeding when traveling

I will be flying for 14 hours. I have 9 weeks baby. He refuses to latch, so I start giving him formula. I'm still confused about feeding him when traveling because you know, I need to wash bottles, warm water, add the formula powder, mixing the formula .... and then I will left with dirty bottles. I have no idea how to make the flight convenient. I'm thinking to use ready-to-use formula. I dont know if this differ from the powder. I mean the taste, I'm worried that changing the formula to (ready to use )may cause colic or gas. Also, I will still need to warm the milk because the airplane weather is always cold. Please any ideas!