Can't fast, but need to cleanse what can i do instead?

Would like to water fast, but on antipsychotics and have tried to wean off them slowly, but last time after 5 months of being off medications, I became suicidal. I do have schizophrenia that runs in my family, and think I will stay on them for now.
But wondering what else I can do to cleanse and get my health back, if I can't fast?
I am 5'6, 230 lbs. I like vegan diets, but can't afford a raw foods diet, lean more towards the starch solution.
Would a Watermelon cleanse work? If i just ate mostly Watermelon for a month?
I know of juice fasting, but can't afford that. Tweet