"All bleeding will stop......eventually!"
I would take the soap in the motel and make a lot of lather in my hands and rub it on my face. You might not get the best shave of your life, but in an emergency it will do.
I always bring an expensive a$$ brush (usually 2) with me when I go on vacation. Why should I deprive myself on vacation? If something happened to them, I'd buy new ones. The last time I took a cart and canned goo on vacation, I used them once, threw them in the garbage and didn't shave again until I got home.
FWIW - I certainly meant no offense and apologize if my words offended anyone. I am the proud owned of cheap brushes - mainly an Omega, and am a firm believer in the oft quoted "YMMV" and pass no judgment on anyone...I don't care what you use I just hope you enjoy it...this is a hobby after all!
My OP was simply meant to get some ideas of what others have done when they have forgotten their brushes when away. I suppose I should have specified that I am too cheap to buy a brush that I would only use a few times so making a trip to a drug store to purchase another brush wasn't really an option I considered.
Back home now and have learned my lesson....don't forget the travel brush!