Add anti emetic drugs like syp.ondem after meeting your pediatrician..As to avoid dehydration it is must to stop vomits then only child would be able to consume various liquids like ORS...However if your child doesn't like ORS then u can give home based stuff like coconut water , lemon juice , mosambi , rice water , daal water , butter milk with little salt etc

Please give rice based diet Like idli,rice kanji,curd rice You could also give bland khichdi,green banana khichdi etc If vomiting ors,try giving tender coconut water or plain water If very tired and totally refusing feeds,persistent vomiting or reduced urine,please consult pediatrician