Actually I change my mind about my response, I really, really wish I had have taken a spare air filter.
I took way too much food and found myself eating it not because I was hungry but just to eat it because it was there and not have to take it all home. I also took too much beer but that's no problem at all because now I have beer.
I took about 4 cutlery and plastic crockery and only used one and cleaned it each time. I did not use my little pie warmer either. But these things did not take up a lot of room in the car and it did not affect me at all by having too much of these things.
