V.C.
Home cooked meals are the best money saving practice, I believe. The more preparation that's been already done, the higher the price on food.
Make vegetable or potato soup; cook dry beans/lentils/peas/rice; bake biscuits and cornbread;
Don't buy on-the spot one-serving bottles/cups of drinks nor individual packages of chips, crackers, etc (always go for larger packaging on these things and re-pack them in baggies, if needed for packed lunches, etc).
Angel Food Ministries and S.H.A.R.E both offer great food purchasing power -- 'more bang for your buck'.
Make your grocery list according to the grocer's sale flyer. Over a period of several weeks, they'll have 'on sale' most of the things you normally use. And if you have an 'Aldi' store nearby, SHOP IT first for your basic staples (then go elsewhere for your 'brand-name' purchases)!
Freeze stuff, but try to decide a day or two ahead what you'll use and put it in the fridge to thaw.
If you buy bottled water, opt for a Brita or Pur faucet filter and purify your own (a lot of bottled water is simply 'filtered municipal water' anyway!).
Buy 'used' (clothing, jewelry, appliances, furniture, decorating treatments, etc) if you need something different than what you already have.
Only 'eat out' if you have a coupon for the meal whether it's pizza, fast food, or sit-down quality meals. And most buffets have a less expensive 'lunch' price before 3:00 or 4:00 o'clock.
Remember that nothing's a 'good deal' unless you need it.
Oh, just FYI, the all-purpose cleaner, 'Awesome', ($1 at most dollar stores) makes a wonderful pre-wash treatment for most food stains on clothing.
I was raised 'poor' and we raised 4 kids on a teacher's aide salary, so 'pinching pennies til Lincoln hollers' is just a way of life for us! LOL So, these are my basic tips (which you probably already knew, but I hope they help!)