Suggest Substitute For Master Cleanse Or Lemonade Detox

Hello! I am embarking on the "Master Cleanse"/ lemonade detox. This is only my first day, and the hunger isn't bothering me much. The problem is, I think the syrup is giving me a stomach ache. It's so much sugar that I'm not used to! But I'm afraid that if I don't drink enough, I won't be getting enough calories and nutrients. Should I cut down or try a substitution?