What I couldn't live without when I had my own DIVINE apartment (I still miss that place):

1) A really good skillet. I made a lot of stir-fry and one pan meals out of convenience.

2) Single-serving tupperware (to divvy up the stir-fry)

3) 4-cup coffee maker.

4) Toaster Oven

5) Heavy bag & boxing gloves (There was no one to vent to about a bad day when I got home, so I'd hit the heavy bag) It was great therapy.