Pretty much everything I consume. The main exceptions are canned tomatoes (the store brands are always sourer than I'd like), some cheeses. I used to also buy brand pasta, but ever since my supermarket got its own generic bronze-cut pasta I no longer need to.
When it comes to medicinal products I'm more likely to get a brand version though, e.g when the brand version works better, like with Tiger Balm, or when a generic isn't available.