Today's bowel cleanser is moviprep. This stuff isn't flavoured, it just tastes terrible. Both doses are the same, unlike plenvue that has a numbered first and a second dose mix.
The moviprep is a mix two powders together then mix in the water and drink, sorry sip over an hour with water. This, i think, is to rinse the flavour of the moviprep from my mouth.
Edit: Supposed to be lemon flavour, but not to me.