Lots of great ideas here! I got "downsized" 2 years ago, so we had to change some things. I use coupons, shop sales, go to thrift stores and yard sales, recycle as possible, cut out home phone-only cell, use lentils for protein in foods, freeze what I can, etc. I use vinegar for lots of things too. It has lots of uses!
In my garden, I make sure to buy only HEIRLOOM seeds. No hybrids! I can save the seeds and plant them the next year. I also share with others.
A good site to look at is: The Hillbilly Housewife. :)