Gavilyte-G

Well the time has come for me to start on this jug... anyone with experience with this prep have any advice or suggestions on how to manage? I'm especially worried about the dehydration warnings as I barely ate yesterday and haven't at all today in order to prepare...

Its 1/2 now and 1/2 in the morning and I've only just gotten through my first glass... I have a feeling it's going to be a long night 💩