Not everyone sees an oily discharge when they go to the bathroom and have a bowel movement. Those who do, generally find it disappears as the body gets better at incorporating the undigested fat into the feces and excreting it.
It's important that you eat the recommended amount of calories and fat for your level to have the best results. Try to bring some portable snacks with you like fruit, veggies (carrots, cherry tomatoes, etc.), pretzels, etc. so you can have at least one snack per day.
I hope this helps. Please let me know if you need anything else.
Pat Baird, MA, RD, registered dietitian