Hydration is a huge factor in croup. My 5 year old son woke tonight with a horrible choking croup cough. We took a urine sample and measured the salt and sugar levels. They were very high, which means dehydration. You can't tell this from the color of the urine. We gave him distilled water to drink slowly over the course of 10-20 minutes and he recovered beautifully. Cough disappeared and no more rasping either. Thanks be to God for water and RBTI!