Wet Wipes. It was that little thing I forgot to get when I had SRS. I had pads, liners, 4 extra tubes of lube... Not fun when you can't leave to buy.
Most probably you can find all sort of lists, but my personal one of mandatory stuff you should always absolutely bring with you is:
Clothes: Dresses or baggy pants, easy to slip on. Velcro or slip in footwear. Even buckles are going to be a major pain. Hairbands and elastic. I would go the extra mile and say "Hammerpants". Underwear one size bigger than usual for the swelling period.
medkit: Laxatives, stool softener, gas buildup meds. You are going to need this. And since you don't want to add more discomfort, bring cold remedies and throat pain pills. You are on risk of catching this from the plane trip and / or moving countries. Also, moisturiser (esponge baths will be agressive for the skin), and something to treat skin rashes. you are bound to get them after so many days in bed.
Electronics: elongators, even USB elongators. Unless you have a smart surgeon that bothers to put a power strip on the bed, you are going to need it. And for the love of everything holy, buy a pre-paid sim card if going to Thailand. Also, if in a non free speech country with restricted and monitorised internet, get a good VPN. Even if you don't need the security, you can use it to get US Netflix.
And I'm going to say this: You will never have enough pads. During the first postop weeks you will be using a minimum of 3 a day, swapping them at least after each dilation. You will be burning through a minimum of 21, and that if your discharge is ok or you are not bleeding badly. Stock that crap in industrial size