options for water?

I have to do my ultrasound and she said to drink 32 oz of water in ten minutes an hour before my ultrasound but I can't do it. I have been trying but after about half my stomach feels really full and sick... I thought I would practice today and it's not working. Is there anything else I can drink? I was told light colored Gatorade or lemonade... just wanted to see if anyone got by drinking anything else. I know it can't be dark colored.... 😕🤔