@colleenyoung I bet @marvinjsturing is waiting for the responses! 1.) If you know the area where your transplant will be, buy some gift cards for nearby eateries. That way your caregivers have a way to get some decent food when they need to. 2.) Don't forget a shawl or lightweight throw to use if you get chilled. 3.) Have a written contact list of people either you or your caregiver may need to contact, especially if you need to go any distance. 4.) If you have financial obligations that may be due while you face the first month, try to pay ahead to avoid late charges. 5.) Pack "comfy" clothes, ereader or book, puzzles, things you normally use to distract/amuse/entertainment yourself. Next?....

I packed many things I didn't use but the following I found helpful and essential.
Notepad and pen for things that I wanted to ask my doctor but kept forgetting. Also used it to keep track of daily activities, medications and notes to my kids.
Earplugs!! Sure helped get me through the nights (and naps). Eye mask to keep things dark.
Charger, phone and tablet, For news and email/texts to family and friends. Earbuds so I could listen to relaxing soothing music.
Toiletries. Extra facecloths and hand towels.
I wore a hospiral gown the whole time but I had track pants for my legs. I found a shawl worked better than sweater, hoody or dressing gown. The shawl left my arms free for IVs bloodtests etc. Woolly socks and slippers.
My favourite blanket and pillow case.
Books if you read a lot.
Mints to keep my mouth moist.
A small flashlight was useful.
We all had our own rooms in the transplant ward but I always asked them to keep my doir shut.
Sorry for such a long list but these items made everything more endurable.
I had one gentleman on my floor who brought in a special pillow to sit upright with arm rests.
Hopefully this may be helpful.

For my heart transplant, I had difficulty handling all of my meds. I used Biotene lozenges and these settled my stomach for some reason.

So many great suggestions here, I have little left to add.
People have mentioned paper and writing implements to jot down questions. I suggest a notebook to keep track of everything so when you look back you will remember all that happened and that you went through. I meant to do that but the notebook didn't get packed and my husband couldn't find it at home. Of course I figured I would remember everything but I did not.

As @gaylea1 mentioned, a flashlight. I always pack a flashlight whenever I go away.

Also, a lip balm. I found my lips got very dry in the hospital. Thankfully they did have some there and gave me one but it took about a day and requesting it a few times before they actually did. Also, if you prefer something other than plain hospital water ask whoever is visiting you to bring something like Hint, or some sparkling water type of beverages.

Definitely something warmish to throw over your upper body. I have a light fleece jacket and it was a perfect weight and could easily be left on in bed when I was sleeping. I found out from previous hospital stays that I tend to get cold in hospitals.

I like to have slippers too for walking around. Those socks with sticky pads on the bottom just don't do it for me. Unfortunately, I had my expensive UGG slippers with me for one hospital stay and when they brought me down for an endoscopy someone took them off my feet and I never saw them again so don't bring anything too expensive that you value. They were brand new, so I definitely think someone stole them. After that I brought inexpensive slippers.

I can't think of anything else right now, most everything is covered, plus they do give you the essentials in the hospital so if you don't mind using their basic brands you are pretty well set.
JK

Bring a comfortable pair of slippers with rubber soles and a pair of walking shoes. The sooner you get up and about the better. Sweats, zippered hoodies, baggy pajama pants. I got the call at 11 pm and left the house with very little. You’ll be in the hospital for 4 or 5 days and the only thing that I forgot is all my passwords for all my online accounts. Make arrangements in advance for someone to care for your plants and yard. And don’t forget about your pets. The one thing that I did need and did not have was pill boxes once I was released. There are apps on your phone like Medisafe where you can list all your meds, pill shape, size and color, dosages and times per day. The biggest thing for me was not what I brought along but who would take care of things while I was gone. You are going to forget things as you rush out the door but for the time you are on the 10th floor at Methodist in Rochester they will take great care of you.