Things You'll Need
Instructions
Mix 1 tablespoon of sugar and 1 cup of dried instant mashed potatoes in a bowl. Mix them up thoroughly.
Pour this blend into a wide-mouthed jar where you are planning to raise your fruit flies. There should be a 1-inch-thick layer of this mixture at the bottom of the jar.
Pour enough water onto the mixture to moisten it.
Sprinkle a pinch of yeast on the surface of the mash. At this point, the food is ready to support several generations of fruit flies.