That is a great idea, Another UC Wife. Yet another reason for me to go to my favorite store, too !!! We have a new one opening next Saturday and I am really excited about it. I find so many useful items, things for my grandkids and snacks galore.
While there recently, I found a travel kit with a small spray bottle. I had read that when needing an emergency change, it was helpful to have a small spray bottle in the emergency kit. Just fill it up at the sink in the RR and you have a water supply in the stall.
I also use an empty and cleaned contac lens wetting solution bottle for my M9 drops to carry in the kit.
One day I am going to write up and share all the innovative things we ostomate and loved ones of ostomates come up with. I still love your idea of the mousse cap to cover the stoma. I also use it to shield my stoma from the heat from the hairdryer when I am applying my appliance. Works like a charm, and a 3rd hand :)