Remove bacon to paper towel covered dish to drain and cool.
Reserve 1 1/2 teaspoons of the bacon fat.
Combine flour, sugar, salt.
Mix well with 1/2 cup water, let stand in mixing container.
Heat vinegar and remainder of water to hot (do not boil).
Add the hot liquid to dry ingredients, stirring well.
Add the mixture to the bacon fat still in skillet, and cook to desired consistency. (If gravy like texture is desired, you can bring to a brief boil. Overcooking with cause it to congeal into a thick ball).
If desired, you can crumble the bacon you fried and add to salad.
Pour over your salad of choice and devour immediately.