I plan to move and I can already cook, so I decided to start cooking for myself to get used to budgeting.
I started by buying a fridge. I'll be taking the fridge with me when I move out, otherwise it wouldn't have been worthwhile buying one.
I buy food in multipacks that can be frozen. It's cheaper to buy things in bulk, but if you buy fresh for one person, you have to use them up quickly. I've also started keeping my bread in the fridge because I'd only get through half the loaf and it would be mouldy.