Besides the basic food, water, shelter, etc...
I know I could live without any of the below but it'd be difficult/uncomfortable for a while:
undergarments/clothes in general
yup that's three
1) My family and friends. I don't know what I'd do if I didn't have Marah to talk to... 2) My computer. I use it to write. And that is necessary. 3) My bear. This was a hard one, because I was tempted to say my phone, because I love it and I use it to talk to Marah, but I do have a computer for that. I don't know what I'd do without my bear.