Travel w baby

I’m traveling for the first time w my 16 month old and I need all the tips!!! Clueless FTM here. 😆😝 We are flying from Las Vegas to New Jersey next week. I plan to gate check my stroller/car seat (we rented a car). I got a leapfrog computer he hasn’t played w yet and DL’d allllll the Ms Rachel to my phone, for the flight. My sister is an angel. She has a baby the same age, so she has boxes of diapers and wipes, and said I don’t need to pack anymore than what I need for while we travel. Other than those couple of things, I need all the tips you can give me. I’m clueless. What do I do about Bottles (he can’t drink cows milk and we use goats milk. I doubt I can get that at the airport). I still nurse (for comfort/sleep) but he doesn’t get enough for that to be the primary source all day long. He will be a grouch if he goes that long w out milk. Thank you so much for any tips/help.