I'd like to think this won't take as long as Faberry did, because I was thinking of Brittana answers while I did that one, but... this is gonna take a while.
who is the big spoon/little spoon: Santana insists on being the big spoon. Brittany likes being the little spoon, anyway. Though, to be quite honest, they usually end up falling asleep in a big two-person pile.
what is their favorite non-sexual activity: Miniature roadtrips. They'll pick some landmark that's not too close but not too far and make a mini-vacation out of it.
who uses all the hot water in the morning: Santana loves her hot showers. But they shower together half of the time, anyway.
what they order from take out: They both love Italian very much. But Brittany makes Santana try new restaurants every couple of days. Santana's been praying for a Breadstix to open near them.
what is the most trivial thing they fight over: Brittany wants to get a cat, even though pets aren't allowed in their apartment building. They've had quite a few arguments over that. Santana says she doesn't want to get evicted, but really she doesn't want cat hair all over everything she owns.
who does most of the cleaning: They both clean the apartment once a week or so. Brittany does the 'organizing' cleaning while Santana does the things like dusting and mopping.
what has a season pass in their DVR: They both love Grey's Anatomy, it's quite the guilty pleasure for them.
who controls the netflix queue: Brittany. Santana used to pick their movies, but she would always pick action/thriller movies and zombie movies and such, which Brittany did not like that much.
who calls up the super/landlord when the heat’s not working: Santana. She cannot stand the cold, so the super gets quite the earful whenever the heat isn't working.
who steals the blankets: Neither of them, really. They don't move much when they sleep.
who leaves their stuff around: They both do, definitely. Brittany has a tendency to wander around the apartment while she's doing things (talking on the phone, brushing her teeth, etc) and leaves a bit of a mess in her path. And god knows Santana leaves her clothes all over the place.
who remembers to buy the milk: Well, Brittany usually gets home first, and if she sees they're out of something, she'll call Santana and ask her to pick it up on her way home.
who remembers anniversaries: Oh, they both do. Brittany always wants to do something very lavish and fancy, so Santana surprises her with just that every year.