Learn to hunt and fish.
Learn to utilize wild plants in your diet, they are free and nutritious and grow well on their own.
Learn to can and dry foods.
Burn wood to heat your homes. I bought property that has a life time supply of trees. I cut and split my own.
Install an on demand water heater. That saved me $20 per month on the electric bill.
I never heat my bedroom, ever, most of the time my window is open, even in the winter! All the bedroom doors stay closed in the house and are not heated.
Raise and process your own livestock, if you are urban, join a CSA and get more people to join it. The more involved will bring prices down. Process extra cocks and cockerels for your dog food if you don't want to eat them.
Stop eating out, prepare your own meals! Cooking is fun. Food is much cheaper this way.
I only grocery shop or get supplies on the way home from work. I never make a trip on the weekends, ever. The car stays parked.
Compost and garden. I find I only need to mow once a year, the chickens and ducks keep everything clipped.
My best buy this year? A yogurt maker, it is easy to use and much cheaper than store bought. I drop a spoonful of my own elderberry jelly into the finished yogurt, yum!
Read product lables in the stores, TRY to buy American (or what ever your Country might be). Avoid Chinese made goods.
Cancel your cable/satellite and cell phones. We all lived very well with out them not all that long ago. Yes, you can....