This is a difficult question to answer without knowing the specific ingredients and your likes and dislikes. I live alone and I use various strategies to use leftovers and eliminate waste, I'm always learning.
I use my small freezer compartment to hold meal size packages of raw and cooked meats.
I cook ground beef with various vegetables added and then freeze it in meal size packages.
I buy shredded cabbage/coleslaw mix in one pound packages and use part of it in a cabbage salad, a handful in a pot of soup, another handful in a stir fry, etc...
I shop where I can buy individual fruits, vegetables, bulk food etc... so I can get the amount I need.
I buy frozen vegetables in one pound bags so I can pour out just what I need for a meal and toss the remainder back into the freezer.
and sometimes I just eat the same thing over and over and over until I get bored with it!
Hang around DC and you will get several ideas that you can adapt to your situation.