PROBLEM TO BE SOLVED: To provide a water-soluble solid rehydration beverage capable of quickly dissolving an amount suitable for practical use as a rehydration beverage in cold water. SOLUTION: This is a water-soluble solid beverage element that is dissolved in water and taken orally, and is composed of 2% by weight to 3% by weight of salt powder, 14% by weight to 15% by weight of agar powder, and 0.3% by weight. By tableting and molding a base material containing 0.4% by weight of the binder powder and the excipient powder, a water-soluble solid water replenishment capable of quickly dissolving an amount suitable for practical use as a water replenishment beverage in cold water. Providing beverages and refilled beverages. [Selection diagram] Fig. 1【課題】 補水飲料として実用に適した量を速やかに冷水に溶かすことができる水溶性固形補水飲料の提供。【解決手段】 水に溶かして経口摂取する水溶性固形飲料の素であって、２重量％から３重量％の塩粉末と、１４重量％から１５重量％の寒天粉末と、０．３重量％から０．４重量％の結合剤粉末と、賦形剤粉末を含有する基材を打錠成形したことにより、補水飲料として実用に適した量を速やかに冷水に溶かすことができる水溶性固形補水飲料及び補水飲料の提供。【選択図】 図１
