Unfortunately, as someone who has lived in halls, I can firmly say that living in a communal environment also teaches people how to stretch their budgets by eating other peoples' food.
If you aren't lucky enough to becomes a "Friends-esque" unit with your new housemates, you do have to talk about arrangements for food, otherwise you will find you may never have any!!
Tips for halls;
*Sleeping tablets and earplugs if you actually want a good nights' sleep
*Be considerate, and tidy up after yourself, other you will really annoy your fellow housemates and eventually it will all come to a head and you will all end up screaming and shouting at each other for hours because of something really tiny
*Conversely, try and let things go that are annoying you about your housemates; if they are untidy, use your stuff without asking, etc etc etc, speak to them once, nicely and politely. If they continue to do so, speak to them again. If they continue doing it, move your stuff or whatever, but try to just let it go, otherwise you will end up with hostility, which just wont be worth it in the long run as it will ruin your experiences in halls
*Take nice little things for your room to make it feel more homely - a lamp and my favourite framed photographs were my essentials. Halls can look very bare and clinical so you'll feel happier if its' more comfortable for you.
*Get involved with as many people who live in your halls as possible - there will be loads of social events, especially in the first few weeks - then even if you sont end up being best friends with your actual housemates, you have plenty of people close by
Hope some of this helps!!