I have a colonoscopy tomorrow morning and started the drink at about 3:30. It is now 4 with nothing happening, but thst isn't the problem. The problem is I'm struggling to get any down!! I'm reaching and gagging when I drink it... I've mixed with lemon squash & orange squash but nothing helps. I've got coke to wash the taste away but it isn't doing much at all. Any advice?? Please!!