It is not clear what are you looking for? A cancer cell line can not be "normal". If it is a "cell line", it is immortalized, therefore, not normal. Indicate clearly among three choices- (1) primary colon epithelial cells; (2) an immortalized colon epithelial cell line; or (3) a colon cancer cell line.
I understand that you are looking for an immortalized colon cell line (non-tumoral). If so, I would suggest CCD18. I have worked with it, it is easy to culture and does not need special requirements.