For the citric acid , since the "activator" solution I have is 50%, would I need to add 4.5 times more water to bring it down to 10% (I don't trust my math)? I also have undiluted apple cider vinegar on hand.
One other question: do you think this 1 gallon mixture is also suitable as an oral 'cidal' rinse (especially to reach the roots of the teeth), or would you suggest something stronger?