Being mobile with your parrot means remembering to bring everything that maintains him or her at home, plus more.  I like to carry a diaper bag.

Contents:

Low rim cup for water
Food bowl
Ice Pack (to keep food cool)
Snacks
Water bottle
Wet wipes
Kleenex
Poop shawl
Piddle pads (cut in half)
Parrot first aid kit
Human first aid kit (antiseptic spray & bandages)
Parrot Journal (including info: leg band, vet contact, pet insurance, habits, words, etc.)
Towel (for placing on backs of chairs)
Scarf or Blanket (for wrapping around her if cold, windy or to gently restrain for protection if needed)