Hi Liz, glad you're doing well. :) The hospital is never a fun place.
When my husband had his step 1 (he did the 2 step process), he always had high output from his stoma. They were all freaked out about it at the hospital but it was just how it was. His doctor said he had to put his stoma high up in his small intestine, so there really wasn't much distance between his stomach and his stoma. He easily was outputting 1200-1800 CC's a day. Immodium didn't do anything for him at all. Lomotil didn't do anything. Also, throughout the entire eight months he had the stoma, his output was pretty much always liquid. It would get a little thick if he ate apples or chips but it would go right back to water just as fast. He also could not tolerate sugar, so once we figured that out he improved as well. Sugar just made stuff go through him even faster than it already was.
If you do have a high output stoma, then you'll just need to make sure you don't get dehydrated. He only got dehydrated once but that's cause he wouldn't listen to me and was downing all kinds of soda, ice cream, slurpees etc... so, after he got out of the ER he straightened up and we got him some electrolyte pills... those were a life saver.
I actually don't think doing it in 2 steps is a bad thing... I know there is a big debate over which is better ... but I (we) actually think its better to get it all done in 1 step and then wait it out for the take down. Just seems like going through 2 major surgeries would be way harder to recouperate from then to just recouperate from 1. But as long as everything works out in the end. :) He is super happy with the results and is almost totally back to normal just 6 days after his takedown.
Hope you do well with the rest of your journey! ;D