70% ethanol is a great backup sanitizer, especially on surfaces. It's effective, cheap, no-rinse, and evaporates quickly.
beerandwinejournal.com/70etoh-sanitiz…
My book -- "Methods of Modern Homebrewing," by Chris Colby (2017, Page Street Publishing) -- is out today! Find it at bookstores (see link) or online at Amazon or Barnes and Noble.
indiebound.org/book/978162414…