I travel a lot for work in 12-month durations and there's so much little stuff that pops up that you'd never even think about until you need it. Definitely some good stuff has been posted already..
I'm just gonna rattle off some random s***; measuring set, oven mitt, baking sheets + pans, toilet brush, plunger, hand soaps for each bathroom, medicine cabinet stuff like tylenol, tums, band-aids, etc.,
a broom
a mop
a swifer
paper towels
toilet paper
disinfectant wipes and spray
air fresheners
dehumidifiers
a couch
a bed
bedsheets and pillows
a coffee and dinner table
drinkable water
plates and utensils
disposable plates and utensils
disposable gloves
garbage bags and can
Have a woman just walk around your crib... it will humble you.