Well, it depends.
Cloths wise I usually buy band hoodies/t-shirts etc, and then whatever trousers i can find that I like, as long as there very baggy of course! You would never see me buy adidas or nike and so on.
Shoes....well i'm limited to what I can actually find for the right price/design. I have 'skater' shoes if that makes any sense.
Food and drink I buy whatever, try my best to avoide the big corparations if i can, as long as i remember, it gets confusing nowing which company makes which product.