Reconstituting is as simple as adding water. Warm or hot water rehydrates foods faster than cold. Meats, fruits and veggies soak up what they need and then the rest can be drained off. Dairy products or soups: just add water slowly and stir until desired consistency is achieved. That same idea can be applied to meals. I recommend pouring the freeze dried meal in a casserole dish, pouring a couple inches of water over it, covering with foil and putting in the oven at 350, checking every 20 min or so, stirring and adding more water if needed. There is a small learning curve but it is very simple.