My 3yrs old girl go to preschool. And she seldom drink water so cause her constipation. Any solution ?

Hi, I think you can make some juice for her which she likes and fill in her bottle and she then would herald drink it. You can also have two, three sippers at home and keep them filled with water or different varieties of homemade juice and keep them all around the home. This way your daughter would out of curiosity would drink from it. Let those sippers be of her choice. Like, Elsa or Anna painted on the sipper and things alike. Also, whenever you go to the park, make sure to carry her water bottle to the park. This is the best time when she would have plenty of water and that too without your telling her to do so. In the parks kids play and they feel thirsty when they get tired of playing. Since, most of the kids carry their water bottles, she would also want to drink seeing other kids do the same.