Ok food I would follow Breacher's advice stack totes ( $5 at Wal-mart ) variety and sufficient caloric intake. Vitamin supplements to make up for fruits and vegetables you lack. Sprouting is a great way to go and aids in digestion. Stay away from dark beans though check out sproutpeople.com
You can lay in a lot of seed compared to canned food.

Sanitation, really depends on water we use water to flush wash etc. Your building's septic stack will backup in short order then your neighbours will begin tossing waste out the windows, hope you don't live on the ground floor. Plan to keep your waste I suggest 5 gallon buckets lime to cut down on stench untill sealed. For washing baby wipes.

heat, it will be impossible to go beyond a few days heating your apartment. I'm sure there are restrictions on storing fuel in your building. If you can get expedition quality sleeping bags for the family. I suggest you construct a room within a room. don't freak out I'm talking under the dining room table or perhaps a camping tent to hoard heat in. Even if the rest of the apartment is 25-30degrees one persons body heat alone will keep your demi room in the 40s. burning just one candle another 5-10 degrees, I don't recommend a candle though because of ventilation, losing heat through vent, and fire hazard. lastly drape your demi room with 2 layers of mylar space blankets.

more later its getting late I got church tomorrow. if you don't already go I pray you start.