The college fee is only paid by Overseas students and is in addition to rent and food etc, it covers academic facilities and other facilities so things like tutors as you mentioned.
Rent at Univ is around £3600 for the year, so £1200 a term. Food in hall is around £3-4 a meal, but you can get cheaper if you go for salads or soups etc.
Kitchen provision is fairly good in Univ, you will normally have access to at least a microwave, but there are proper kitchens dotted around. Once the new building is finished, that will have fully kitted out kitchens on each floor as well. You are also allowed a kettle in your room, so can make most food like sandwiches, hot drinks, pot noodles etc without having to go anywhere
Most people tend to eat lunch in hall, but this does vary a lot. It's completely up to you how much or how little you eat there. Hall is paid using a top-up system, so if you don't eat there you don't lose any money.
I spend around £500 a term on food, but I do tend to buy a lot of takeaways or go out for lunch etc so this may not be very representative. If you budget well you can definitely spend less over the term if you make smart food choices
Accommodation wise for Medicine - you definitely get accommodation for the first three years. Then I believe the course works in that you have to re-apply to Oxford for the clinical 3 years. If you then came back to Univ, I believe they offer you first year on-site, and then you can live in the off-site annexe for the last 2 years. By this point though you may prefer to rent a house of your own and live out