Or white vinegar which doesn’t need to be refrigerated.
[all the lemon juice I’ve ever bought says to refrigerate after opening...is there some brand available that *doesn’t* need to be?]
No, you would probably need to use it all. Although for emergency use, it would do and you can buy those little bottles (shaped like lemons) for under a dollar and get 20 or so at a time. One use bottles when needing to clean a surface or even a wound (but God how that would hurt!)