Hot Bath or Cook Postcard

Hot Bath or Cook Story On a cold winter night, Apple (Shuishui's sister, (◎▽◎)) thoughtfully took care of Shuishui as she bathed. She had prepared hot water in the kitchen and added "bath salts" while Shuishui was soaking. Apple's seemingly thoughtful actions didn't arouse Shuishui's suspicion, nor did she notice a recipe about herself taped to the wall! But Shuishui was enjoying such a comfortable bath, how could she realize that she was the ingredient in this very kitchen?