Inducing peristaltic action via hot water will not cause problems. :) It's just a natural reaction, a natural aid, hopefully someday soon you won't need to do even that much except after particularly heavy meals. :)
You have several options for stone softening agents besides just apple juice! :) Have you read my liver notes??? The Clark recipe is the basic way to go but it doesn't explain the many aspects of having a successful, comfy flush, so be sure to read more - my notes, Andreas', Dr. Schulze , lots of good stuff out there. :)
For candida, the best options for pre-flush protocol are:
Malic Acid (the active ingredient in apples) supplements, 1,000 mg 2x day for 3-7 days
Gold Coin Grass from www.sensiblehealth.com
Liquid Phosfood, only 7 bucks, take 10 drops 3x day for 3 days or thereabouts.