Just go back to the way you were eating before the trip and the processed junk food. There really isn't a magic solution. Laxatives will disrupt your electrolytes, and often have a rebound effect when you stop them (making the constipation even worse). Fasting will slow your metabolism and will do nothing to get things moving easier.
When I traveled to Texas (by plane from Minnesota), I brought along energy bars and ate fruit at the airport stands. I also researched ahead for grocery stores in the area I was traveling to, and bought simple items like oats, canned beans, salsa, produce for salads, tortillas (without fillers), pumpkin seeds, peanut butter, fresh and dried fruits that keep without refrigeration. I ate a lot of raw food as surprisingly it tends to keep without refrigeration. I had stayed in an old historic hotel that had a small cafe with a microwave, but did not have a refrigerator of my own. My partner's parents were staying in a trailer/camper nearby and his mother allowed me to keep some produce in her tiny refrigerator. So for breakfast at the hotel I would just add hot water to the oats for breakfast and have a mango with it. I would have peanut butter tortillas, and beans, rice and salad for dinner. It was a tiny town we stayed in, not known for any specialty foods, but I was able to find soy milk and simple stuff.
If you know ahead where you will be eating out, you can always call the restaurant and ask to talk to the cook/chef to see if there are vegan friendly items that can be thrown together. For example, beans or nuts/seeds in a simple salad with a vineigrette or olive oil instead of a salad with chicken and loaded with ceasar dressing. If they have hummus, see if that could be added to the rice and veggies. Once I had to attend an all day staff meeting at work that was held at a banquet center attached to a steak house. The food items being catered to us were not in the least vegan, so I did call ahead to inquire about vegan options for myself to be catered in. I didn't get a response (chef was busy and didn't get back to me in time), so I brought my own sandwich to the meeting. Well, I was surprised when they brought the food out and a waiter came over and asked if I was the person who inquired about the vegan options. He sat a beautiful vegan pasta/bean/veggie dish with tomato based sauce in front of me! It was custom made, not a menu item they have per say, but they do alter dishes for special diets and were quite familiar with vegan cooking. You never know. Can't hurt to call or even if you are already there, ask to talk to someone and see what you can get!
In the end, only kindness matters. - Jewel
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