[BobTheDino]

Bizarre that no one has mentioned coffee as a trigger, every gastroenterologist or dietitian has asked me if I'm drinking coffee. You don't give any details about what treatment or dietary changes you're following to help with your symptoms so it's hard to respond but here's the standard advice:

Soluble fibre supplements like psyllium husk can help slow things down by forming a gel and keeping the stool together. Remember to drink a lot of water.
Imodium, and OTC anti diarrhea medication is often used by people with IBS D to control bowel movement when travelling.
Have you looked at the low FODMAP diet from Monash University? FODMAPs are a variety of sugars found in various foods that could irritate your small intestine, cause excess water to be produced and speed things along.
Though this is usually associated with lots of gas. Have a look at the main FODMAP culprits like garlic, onions, wheat, dairy (lactose).
But DO NOT follow a low FODMAP diet without the supervision of a dietitian or you might ruin your microbiome over the long term. So find one that knows about the FODMAP diet first.

Lastly, some probiotic supplements might help as well. Personally I've used products from the brand Intoleran, which is available in the EU and UK and I found their one a day probiotic to reduce my gas symptoms and improve stool consistency, but that's anecdotal.