Never throw out the liquid in canned goods as you might need it later for drinking or cooking. The veg liquids can be frozen and accumulated for veg stock/soup stock. Canned pea liquid is too strong for a basic stock but a little will give some flavor. Use the pea liquid when cooking dried peas. Beet liquid will turn the soup pink so use it to dye breads and as liquid in chocolate cakes.
Save meat liquids for stock. Boil bones for stock. Save the fat, especially the ham fat, for cooking. Fat is needed to make tamales. Chicken skins can be fried or baked for chicharrones.
Obviously, fruit liquids can be used in baking or as drinking juice.
Dry onion skins can be tied in cheesecloth for flavoring cooking. Or whirl them in a blender to make seasoning along the lines of onion powder.
Citrus fruit skins will make the citron in fruitcake or candy. Zest the fruit before eating. Leave the zest on a plate to air dry and store in an old spice jar.
Keep on top of rotating the pantry and the fridge so nothing has to be thrown out. Eat up the leftovers before cooking anything new. If the family won’t eat something, turn it into another dish or freeze it for a later date. Use the dehydrator if needed. Learn to home can.
Very good ideas!