Yes you need a solution. I would suggest to use Oxypowder , this will also clean your small intestine. The colonic does not.
All the solids will be reduced to water, so it is a comfortable cleanse. I have used it in a combination with a liverflush.
I took 6 capsules a night for 4 days, 1 gallon of organic apple juice over the 4 days. In my case I also used phosfood because I have a big gallstone. In your case you don't need it.
If you do want to start just with bowel cleansing you just can follow the instructions.
The liverflush recipe is also on their website.
Johanna
PS: colosan is the same as Oxypowder
I hope I did not answer you before on another forum. Anyhow better twice than not at all.