To reconstitute is to add water or another liquid to a dried food so as to restore it, as closely as possible, to its original state. Milk powder becomes milk again, dried soup becomes soup, and freeze-dried coffee becomes a drinkable brew. The process reverses dehydration, but the match is never perfect: volatile aromas lost during drying do not return, and texture may differ, which is why manufacturers optimise particle size, use agglomerated powders that wet easily, and print precise water ratios and temperatures on the pack. In food aid and emergency feeding, reconstitution must use safe water, since the dried product is not sterile. Done correctly, it delivers a convenient, lightweight food with a long shelf life and a faithful flavour.