Each person in the house signs up for one night to cook for the household each week. This means someone else cooks your dinner at least four nights each week. There are often leftovers for lunch the next day as well.
In November 2014, the BBC's Why Factor ran an interesting segment on cooking, civilization and social bonding that offers some strong scientific evidence to support eating communally. It's definitely worth the 18 minutes.
We eat a vegan/vegetarian diet. This allows us to save a considerable amount of money and live in a more eco-friendly fashion. (We do buy dairy and eggs with house money.)
Some of us do not drink alcohol, but none of us are opposed to the (responsible) consumption of alcohol at the house. We do not, however, buy alcohol with house money and there is not likely to be a consensus on changing this.
We pool our money to shop for groceries each month. Currently we each put $130 a month into a shared account for groceries, newspaper, toilet paper, dish soap, laundry soap, and other shared household items. This way there are no assigned cupboards or refrigerator shelves for each person. (This doesn't mean you can't have a food item just for you, just label leftovers from eating out or food you have prepared for a social gathering so it doesn't get eaten by someone else by mistake.)
Buying groceries is a task that is currently rotated among the housemates in teams of two.