Sounds like you have a lot of essential things.
I can only think of little extras? Donít own a chi (yet) , but we have another 5 month old pup at home so some of these might still be appropriate maybe.
One thing Iíve found handy are treat bags - little drawstring pouches that you can attach to your belt/jacket etc. they keep treats fresh (and are less destructable and less bulky than carrying around the packaging that treats normally come in).
We bought a heartbeat puppy pillow/comfort cuddly toy in case our pup ended up not settling...but she settled through the nights straight away and just uses it to play with lol
Could be another thing to consider looking at though?
Not sure where you are from or what climate you have, but you could start looking at small practical raincoats/winter coats for when you need to take puppy outside (to get used to garden/play/potty training at first, or you could buy this later when puppy is fully vaccinated and starting to go on little mini walks?) ...but would be best buying when you have the pup so can buy the right sizes I think.
I also second the idea of a play pen
, puppy can have own secure play space which is much safer than letting loose around the house until she/he is a bit older.