It is termed as nature's call for a reason. Along with many other things, this is something that you can not ignore. However, certain times it gets tricky,especially when you're outdoors with no proper place to do the deed.
Holding your pee can have other consequences but when you're out, you can't really let it out. What do you do in times like this?
Not everyone wants a stranger in their bathroom. It's kinda disgusting to allow a stranger to work in the Washing Closet. I would never do that, personally. Besides, I think one must not do it in open and in emergency find a bag or a bottle and dispose of it later.. If you know what I mean because according to the future mission the ammonia found in the urine is collected and fed into a battery-like fuel cell, which converts the ammonia into nitrogen and water, emitting power. 'Cuz you can always find a better way to do it, especially environmental friendly
This is a tricky one, but I think you should look out for a bathroom nearby and if not found, ring the bell of someone's door and request them. I hope people will understand.