So I don't mean to sound like this but... you want to trust a random website's advice?
I'll start to say that no one needs a colon cleanse as your colon naturally cleanses itself. If you are having constipation issues, increasing your fiber and water can help. Otherwise water and psyllium husk is a an extra boost if that doesn't work.
Secondly, that safest colon cleanse doesn't look safe. It includes Aloe Vera juice which has been linked to some very negative health effects. Also, that is a lot of apple cider vinegar and too much can eat at your tooth enamel. Lastly, this site looks like it was created as a way to sell Oxy-Powder and nothing else. I found this site that gives a good breakdown of Oxy-Powder and why you should avoid it: http://nutsci.org/2010/06/23/oxypowder-is-a-scam/
My advice is stay far far away from this formula.