[Hydration] Develop a product to encourage hydration in elderly

So my mom had minor outpatient surgery on Thursday including general anesthesia. Strangely her memory seemed better afterwards, she also just looked better, almost younger. I joked that is was really odd, because she was very worried about anesthesia. I finally realized it must be the iv fluids, she drinks so little normally, just being hydrated made such a difference. I tried the jelly hydrating candies about a year ago and she didn't like them. I don't know how to convince her to keep up the hydration. Thanks for all the suggestions. Fortunately mobility isn't the problem here. And she is only very mildly incontinent. She doesn't resist going to the washroom. She just always asks for a drink and takes these TINY sips. There is one beverage she likes (besides wine) and it is perishable so we can't get it shipped.