Thanks, all of you. I did figure I would follow the instructions and go for it. So far I have had my two drinks of epsom salt/water and later I'll drink my olive oil/grapefruit concoction.
I do have diarrea already though from the two epsom drinks! They have just passed right through me, so my concern now is that I won't be able to stay still lying down all night! What if I have to move to use the toilet? I wonder if I should still go through with it?
I think if I still need to go right before I take the drink, then perhaps I shouldn't do it and risk having to get up! I'll post my results in the morning!

thanks! alison