I don't have a Loop Ileo, but I have had several feet of my small intestine removed due to CD (as well as all of the large and the rectum). So I can speak a bit about the dehydration issues. Sorry I can't help a lot with the other questions tho.
I have taken up to 9 immodium a day - 3 with each main meal. BUT I am now down to only 3 a day - first thing in the morning. That seems to be my busiest time! Anyway, here are some of the alterations I have made to my diet in the last couple of years that has seemed to really help slow my output.
First off, I don't drink caffeine. No regular coffee, but I do drink a large, homemade decaf latte in the mornings, along with a fuit grain bar and a banana.
I no longer drink carbonated sodas... I switched to Cranberry/Black Cherry Juice or Cranberry/Peach juice cut with 2/3 water and 1/3 juice. I mixe them in my water bottles. That means I get about 8 water bottles per gallon of juice. I still get some of the sugar, but none of the carbonation. I got tired of gatorade and this is working for me for now.
I also have really tightened up on the amount of spicy foods and fried foods I eat.
I tend to eat lots of rice and baked potatoes. Also applesauce works well. I don't totally concentrate on what my diet is, but it is a way of life. I can eat about anything, except some of the more fibery foods. I'm more fearful of blockages than anything - I've had several partial blockages in my past.
I hope this addresses some of the output issues. Oh yea, they say increasing your sodium, ie pretzels, crackers, etc, will also help the dehydration issues. I tend to automatically eat more salty stuff anyway.
Good luck JoAnn.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery