Just see what happens. If you are running clear out the other end... you are done prepping.Why these Docs think that everyone has to drink the same amount of this stuff is beyond me.And there are more gentle preps available and they do not use them.It defies logic.If you are able to go through with it tomorrow, great!If you are not.. you tried and that prep is simply not the one for you.If you must re-schedule tell them clearly you simply will not use that prep method and he will have to come up with another that doesn't involve drinking that amount of stuff.If they still won't do it.. I swear, your best bet is finding a Doc that will work with you.I'm rolling you some good thoughts and I am hoping for the best for you.Keep us posted.BQ