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https://lemmy.world/post/616615 there are great tips in that thread, I think you can find a way.
The OG Lemmy meme.
3 days is one thing, 8 days is impossible, (unless you don't eat anything.)
I have a newborn that hasn't had a shit for 5 days. According to our doctor, anything under 10 days is "normal".
So to answer the question...breastmilk?
Delicious, nutritious, shitless
My dad once said, "if breast milk is the perfect food, babies shouldn't have to poop".
I did a 7 days water fast and as far as I remember I only pooped on the second day or something.
And on the seventh day, God dropped a holy deuce and rested.
Honestly, over 8 days, I feel like even if you only drank some kind of liquid nutrients, your body would still filter out enough solids that you'd have something moving through your colon