Up to you. It’ll still be there tomorrow if you add it today. Or if you’d feel better rationing it, I won’t judge. If something happens to the electrician, (lord knows things happen) keep adding one days dose indefinitely, and the buffer should stay mostly in reserve. But make sure to mix well. It’s heavier than water and you don’t want it puddling up somewhere. If you brush, pay some mind to where you are brushing to, as well, so there isn’t half a puddle there.
You know what you’re doing. Stay far away from minimum and pay a little extra attention to it in the meantime because of the current issues. (See what I did there ?

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