Hi!!! If you are flying in, go with one of the town car services and you get a 30 minute grocery stop. Buy a styrofoam cooler and fill it up with waters, juice, milk, fruit, healthy snacks (for you) and formula!! I would buy the "ready to feed" kind and those little cat food can covers fit them perfectly for the "leftovers". Just keep it nice and cold in your cooler. Bring one of those little individual bottle warmers for the room and don't forget the bottle brush and dish washing liquid!!! If you don't already use ready to feed, try it for a few weeks before , so that the baby is used to it. My baby did change from powder to concentrate to ready to feed and did fine on all of them , but you never know.
Buy the expensive "utlra" diapers for the trip.
Also, bring all the meds (for you and baby)you can carry with you and thermometer. A lightweight stroller is a must.
If you are going out for half a day, just pack a small diaper bag for that time and then repack it to go out later.
Take a mid-day break, just to get the baby out of the "overstimulation" of the parks.
I regretted leaving my humidifier home this last trip. The room was soooo dry!!!! It also cuts down on noise when you and baby are trying to sleep.
Have fun!!!!!