No instructions on how to prep for my colonoscopy. Please help.

I'm supposed to have a colonoscopy about noon on Monday the 27th.

I thought I had the instructions included with the medications that were sent, but that is not the case.

Medications that they sent me to Prep with:

Three Bisacodyl tablets (small orange pills)
Small bottle of magnesium citrate
4 liter jug with PEG powder

Now I understand no solid foods etc on the day before the procedure.
My problem is I do not know what order to take the medications.

I'm pretty sure that I drink the 4 liter mixture first, but I'm not sure about the other two medications.

I can't get ahold of the clinic to ask them,

Can anyone here help?