Here are some things I had ready:
A small scale for weighing foods later on (ordered it online)
Small cups (about 5 oz) to eat out of
Small spoons (like mini coffee spoons)
Liquid vitamin
Liquid or chewable calcium citrate
Chewable Zinc (required by surgeon)
Pill crusher if you are on any meds that don't come in liquid form
A heating pad - GREAT for the post-op shoulder and back pain

Gas-X strips
Liquid Tylenol
Filled other prescriptions my surgeon gave me (Liquid Vicodin, phenergan)
Isopure Zero Carb Protein drink (tastes good and goes with a clear liquid diet)
A sampling of protein shakes and whey protein that I tried before surgery
Sugar Free Jello, Broths, Sugar Free Pudding in the Fridge
Lip Balm
Comfortable lounge clothes
Plan on sleeping on a couch or recliner. Last night (post op day 4) was the first night I could sleep in my bed comfortably.
I only took me and my glasses to the hospital and the lip balm. Didn't need a thing while there. Had a pillow pre-positioned in the car for the ride home.
With these supplies, I have had a very comfortable week. Have not had to go shopping for anything!
This is an ecxiting time for you! Don't be nervous. I love my lap band already!