I had years of issues with my GI tract and stomach before I managed to get everything working in some semblance of order. In that time I mapped out every port-a-loo and restroom on my route. Still had to go in the woods a couple of times. Hence the reason why TP was in my commuting bag for the longest time.
I could lock up my bike in 20 seconds flat but did not bother at times.
The worst was a 5F snowy early morning commute and a port-a-potti that had just been cleaned and was covered in blue water. I think I set a record with that one.