“How can I detox my bowels in one day?”

Please consult a physician.

It is not necessary to "detox" the bowels. This is not a medically valid concept. Even those who espouse this practice cannot define it, demonstrate it scientifically or provide valid documentation of any efficacy. You may have abnormal bowel motility, hypersensitive bowel, malabsorption of carbohydrates or other conditions producing symptoms that are interpreted by some as "toxins" in the bowel or in the stool. But there is no evidence for toxins needing to be cleansed from the intestines. There are plenty of people trying to make money pushing these unsubstantiated claims (much the same as the probiotic and vitamin crazes - the former holds out some hope but extensive research has shown little to no benefit, and the latter has been thoroughly debunked).
I encourage you to seek other explanations for whatever ails you from a GI standpoint, and I do appreciate the opportunity to address this issue.

Your bowels don’t need to be detoxed.