Someone asked about what I would put in an emergency kit for IBS-havers having to travel by car, or anyone who may need to worry about messes while away from home.
Here's mine, more or less. I tend to overprepare.
This bag ideally is flat bottomed and has a lot of pockets inside and out, but it REALLY needs a shoulder strap so it will hang from a bathroom door hook.
Suggestions for contents:
A dose or two of your rescue meds or any OTC stuff you use
A fistful of nitrile/latex gloves in a baggie on top, and more tucked in outside pockets
3 or more washcloths in plastic baggies (wet them in bathroom sink or with water in the car, bag them again while wet, carry them to the stall, use them, put into a big trash bag when you're done)
Tiny bar or bottle of soap, bagged with washcloths
Peri/postpartum squeeze bottle/portable bidet (less wiping)
Dude Wipes; NOT KIDDING about this brand, they are bigger and tougher
A topical treatment for hemorrhoids with painkiller, it acts as a barrier to acid poops used beforehand, and soothes afterwards.
Tight-fitting masks for odor control
A bunch of kitchen trash bags (13 gal), I fold them and put them all over the outside of the bag in pockets, and also a bunch inside.
Roll of small trash bags (3-5 gal)
Roll of GOOD TP, squish flat
Roll of GOOD paper towels, squish flat
And I put a bunch of emesis (barf) bags in on the very top because bodies can do more than one gross thing!
Visa gift card with some money on it to buy anything else you need
Kept in the car if there is room:
Rescue meds and barf bags in the glove box.
One or two 1-gal+ jugs of water with the plastic carry handles
Some smaller water bottles, especially with squeeze type tops, can be used to rinse, useful for taking water into bathrooms to clean up
A couple of big beach towels to fold up and put over a mess, or to put under you if there's concern about not making it to the bathroom
Ideally: smell-Eze bio waste solidifier and deodorizer or something similar, and a small hand broom and pan to sweep it up, for very wet accidents
Fabric cleaner made for pet messes can be good to have in there too
Flipflops you can put on and toss if you step in something
Some heavy garden trash bags
First aid kit, good in general
Build this all up gradually if you need to, starting with lots of gloves and trash bags, toilet paper, wipes or washcloths, and spare clothes.
I have no idea how to modify this for public transit or other forms of travel, sorry.
Best of luck and I hope this was helpful! It isn't easy to reduce travel anxiety when so little feels within your control, I know, but it is possible to be more prepared for the worst, and that brings some peace of mind at least.