It's standard fare in any healthfood stores, may even be in a regular drugstore or supermarket.
Do a curezone search for smooth move and you'll find all kinds of posts.
I'm no expert on anything. I'd avoid meat (but I do eat eat) only because it would seem to be such a heavy load if you are trying to avoid constipation ... for now, anyway. Fish and chicken sounds fine. Salads and nuts are good, too.
When I make salad - I take cuccumbers, celery, carrots, lettuce, apples ... chopped it up in food processor. Add a couple of scoops of sour cream and 2 tbsp of sunflower oil. Makes a few cups.
Have you done any extended colon cleansing programs? I've always used Colonix. Some like it some don't. Check the sponsor listings at the bottom of the page and read through some of the other Bowel Cleansing forums.
I also drink a combination of ACV w/baking soda, colonix, a dash of Sea Salt , cinnamon tea from raw cinnamon, cayenne pepper, topped off with OJ - this all my latest concoction, taken from various protocols.
Read up also on cayenne pepper - another one of those "magic bullets".