ok guys starting to freak out!

I leave in 3 days from the east coast on the US to the west coast with 1 stop.

we will be checking the carseat. and I have a small collapsible stroller for the airport.

I've looked up TSA rules and plane to bring bottles with formula powder and just add water when needed. even if that means buying water once we get through security.

we have a set of noise canceling headphones and a list of favorite songs read to go. I really really really don't want to use a tablet to entertain my son it will be the absolutely last resort.

what where your saving graces on flights? must haves? what just sat in your carry on that wasted space? what do you wish you did have?