I have an Ileostomy and I have FAP, so I get double scoped pretty regularly. Ugh, just found out that I have to be scoped in 2 weeks and I just got scoped 2 months ago!
Prep is pretty simple.
The day before... for 24 hours, only clear liquids. Nothing Red dyed. Broths and stuff like that. Then after midnight, nothing at all. You'll be right as rain.
Once, as a dumb experiment, I drank about 8 ounces of the Golightly (shudder) that stuff is vile!
If you have an Ileostomy, your system empties about every 12 hrs, so if you go on clear liquids the day before and then absolutely nothing 12 hrs before you will be perfectly fine.
BUT the regime your docs suggest sounds excessive. Can you talk with them again before? Ask why such a severe regime.
I'm not sure what the fleet enemas are about I have to say. With the ileo, that lower part isn't really getting stool ... right? So one enema should do a clean for that area.
And as ZaliBee says about how ileo systems empties ... 12 hours of clear and 12 hours of nothing should do it. I'd do closer to 24 of clear to make sure.
But you need to touch base with your doc again.
All the best and let us know ... we are all curious as to what they are thinking