Easy Home Preparation. Heat water, milk and margarine according to the chart on package in a saucepan to a boil. Remove from heat and stir in Idahoan REAL Premium. Let stand one minute. Mix with fork and serve. Butter may be substituted for margarine. Easy Foodservice Preparation. Measure hot or boiling water according to the chart on package into a serving container. Add Idahoan REAL Premium, wet all the potatoes and let stand for one minute. Stir well and serve. Butter may be substituted for margarine.