Hope to Catch a Blue?
You need your grooming supplies, a saddle (2 pads if possible), a bridle, it's nice to have an extra bridle or at least an extra set of reins. You'll need an extra halter and lead just in case you break a lead or a halter. A haybag would be nice, a water bucket... first aid kit for you and the horse...
Bring lots of drinks and snacks for yourself...
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"