I recommend organizing some provisions. You will need food and water, unless you plan to fast. If you fast you may feel weakened after. It may not be a good idea if you have to be working hard the following days.
Think of simple meals that are easy to manage. You can make many foods using just hot water from a kettle.
Don't eat too much so you fall asleep. Drinking green tea with honey keeps the mind aware and prevents drowsiness. Sometimes people avoid foods which arouse the senses (such as using spices, onion, garlic etc). Ideas:
- fresh fruit and vegetables
- muesli with milk/yogurt
- hot soup
- bread and cheese
Other useful things:
- a blanket or sweater to stay warm.
- meditation cushions to sit for long periods.
- sutras / books of teachings.
- earplugs to reduce distractions.
- A "Do not disturb" sign on the door.
- prayer beads / mala beads
- a meditation table: