Suggest Natural Medications For Regular Bowel Movements

Is there an excellent medication and/or natural remedy to keep bowel movements regular (approx. same time daily) ? I am currently taking 4-5 bisacodyl 5mg daily - but don t know if this is safe - due to Not having the urge to go at all, constipation, and not feeling complete when attempting. When I don t go daily, I feel bloated. My current diet consists of primarily salads, fruits, vegetables, meats. I workout 4-5 hours weekly. I have tried softeners, laxatives, Metamucil, etc. but definitely require something strongly. I think i may have ibs but don t know the best diet for this. Thank you for you re help.