hello..... all i can say is make sure you can get as much in as possible and follow the instructions. If you don't, it will cause you to have dehydration. From experience..... stick with apple juice, water, and unsweetened tea or coffee. All that sugar free stuff and 100% juices made me sick and caused me to have nausea and couldn't tolerate any fluids which led to dehydration and 2 unexpected stays after my surgery in September. I"m still learning....