I have this problem a lot, especially when my gastric emptying delay is being particularly jerky, like now. Also, because of the delay, I'm not allowed to eat a lot of high fiber foods, and fruit juices are out for the most part because of allergies.
Though I know you asked about solutions that aren't laxatives, I just wanted to say that I use Miralax pretty regularly, and though sometimes it takes a day or two - it works really well. Miralax works a little bit different than most laxatives too - it's not a stimulant - the propolene glycol powder travels through your system and then absorbs water in the intestines to soften things up a bit. It's not bad to take, either. You can mix it into any liquid - I don't much like it in plain water, but find it unnoticeable in a bit of crystal light.
Just wanted to make a suggestion if you find that you can't stomach the prune juice!
