Another thing that came as an unpleasant surprise to me is that my place didn't have overhead lighting, so I had to buy 6 lamps to keep the place decently lit. If you're really cheap/not lazy, you could get by with 2 if you're willing to move them room to room, but I wasn't going to go for that.
Not sure if anyone else mentioned any of this but some other general good things to have are a first aid kit, flashlights, candles, batteries, lighter/matches, laundry soap, dish soap, toilet paper, bath stuff, cold medicine, toothbrush/toothpaste, condoms, and if either of you are on any medication you should probably get on that too.
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