This thread is for posting only the most advanced pro tips, like shit you learn from full time travel
OK I will post the best advice of all.
The day you are traveling, by bus, air, walking whatever. Three hours before you leave your accommodation drink two or more very strong coffees, feel free to use those little packets you buy to increase caffeine strength. After you drink your coffee, drink one or more liters of water, you will start shitting your brains out, I shit 5 or 10 times when I do this. Give yourself two hours to purge the shit and excess water.The end result is your colon will be empty, you will be fully hydrated but several pounds lighter ready to travel without the need to shit or piss for 10 hours.