I've been in hospital far too many times. In the hundreds.
My essential list is
My own large mug as I can't cope on thimble fulls of tea from the tea trolley - the staff will usually laugh and wash it for me or I can wash it in the sink
2 x 500ml insulated bottles. They ask me to drink lot of water due to low BP but the hospital never has ice and the water gets warm very quickly, so I put the jug of water into the bottles as soon as I get it then I can have COLD and palatable water all day long.
Long charging lead for phone/tablet
Earphones - to watch crap on phone and to block out noise
Own pillow and case - hospital pillows are covered in inflated plastic and I can never get comfortable. If worried about germs throw the pillow out after and boil was the pillow cases. Don't bring white cases and they won't get mixed up in hospital laundry
Fleece throw - depending on the ward it can be absolutely roasting or freezing. Some wards don't have enough blankets to go round.
Nightclothes - I've never been offered a gown to wear (unless for actual operation)
Slippers/slides - I usually bring birkinstocks as they are sturdy enough for physio and easy to put on
Warm socks
Usual toiletries - maybe include some baby wipes if you think you may not be able to get washed independently. Most of the time you will not be helped to be washed bar your hands and face. Again maybe bring mouthwash if you think you can't brush your teeth
Thick moisturiser, lip balm and hand cream - such a lack of air
There is usually a hairdryer on the ward, I've rarely bothered to use it mainly washing and letting it dry as I can't be bothered
A mini mirror might be a good call if you are likely to be bed bound as that's when you can "feel something"
Breakfast bars, dried fruit, healthy type snacks unless you have a great stomach and can eat hospital food. There is usually at least a few days where you just can't handle the meals provided....here they are still closing some wards due to covid and flu so better to be prepared incase noone can get in to bring you anything.
My hospital has free WiFi so I have all the entertainment I need on my phone/tablet. I can read, watch tv, listen to music
Sometimes I might bring in a craft project like crochet depending on the type of admission.
Perfume is a good one - it's nice to be able to smell something pleasant if someone on the ward is doing something that doesn't smell great.
Hope this helps. And that your stay is not too horrible and your recovery swift