How does one live more frugally?  

I would compare the prices at supermarkets and go where you feel you can get a bargain. You can also do some meal planning in advance using say a large supply of chicken and make several meals out of that. I would in addition if you are just shopping for one or two and not a large family, buy generic as it is usually the cheapest way to go.

Ye, I have one. I am totally against buying packaged cleaning products, for example, those spray bottles with so called "glass cleaner" in them. They never get the glass clean, leaving smears everywhere. Heres my tip, use a tiny amount of amonia in warm water, wipe over the glass with lint free cotton and dry with a paper towel. Cheap, effective and youll never see cleaner glass.

A former colleague explained to me that buying things in bulk or in big packages do not necessarily entail savings. The problem of having extra things available on hand is that people tend to consume things more than necessary. People tend to use things scarcely when they know that supply is not enough. She added though that establishing measurements and making it a habit to follow such will really make buying in bulks cheaper.

i dont buy used books, i go to the library and borrow books, movies and music. i shop at thrift stores for clothes plus i make a lot of soup and pasta during the winter to feed our family of 4.

I like to have some very basic staples, and a very simple diet. Potatoes and oatmeal, and carrots are very inexpensive and yet nutritious. My luxury is whole wheat flour, but as you say can be bought in bulk. I make homemade tortilla and burrito shells and can use them in many creative ways for meals but are also very inexpensive. The biggest thing to me is to not have the strange habit of "shopping". I've never understood that habit. And the few times I ever feel the urge I hit lawn sales and thrift stores instead of department stores!
Good luck! Sounds like you are doing pretty good in being frugal..