If you buy canned asparagus, save the liquid and make cream of asparagus soup.
When you boil potatoes, save the water to bake with or use in soup or gravy. You can make white gravy by using potato water instead of milk; use potato water in place of milk in yeast bread and add it to soups that call for potato starch.
If you are baking and need an egg, you can use 1 tablespoon water and 1 teaspoon baking powder instead.
If you are making meatloaf or something that needs an egg to bind it, you can substitute about a fourth of a cup of arrowroot, flax-seed meal, apple sauce or pureed tomatoes or unflavored gelatin for each egg.
Need sour milk or buttermilk? To a cup of milk, add a teaspoon of vinegar, stir and let it set. If it doesn't turn "sour" in a minute, add another teaspoon of vinegar.
If you're out of powdered sugar, you can make some in your blender. Just use granulated sugar and whirl. Add a pinch or two of corn starch to keep it from clumping.
More to come! Add yours in the comments below or email me with them. Let's make a page that's really useful!