Polyethylene glycol 3350 with electrolytes
"While Moviprep is okay at clearing the colon for a colonoscopy, there are two major problems with it. First is cost. This prescription medication costs between $80 and $90 WITH insurance,  which is outrageous and confiscatory given the ingredients. Second is drinking this vile liquid. It tastes so grotesquely bad, it is nearly impossible to choke down, and you have to drink two liters of it. I wish physicians would prescribe one of less-expensive, more-palatable alternatives."