Actually, I think I got it all wrong! I assumed that the solutions were prepared by volume, however, as you pointed out, they are prepared by weight! I came to realize this today, when I tried to produce a table of number of drops for various acids and concentrations.
Please correct me if I am still wrong, but I now understand that the 22.4% Miracle-Mineral-Supplement solution is 22.4% NaClO2 + 5.8% NaCl (plus some other minor components) + 72 % H2O = 100% solution. Each percentage has to be taken by weight.
So, for example, a 100g solution contains 22.4g of NaClO2.
Now I have to calculate the same for the citric acid solutions and other acids, then calculate their molar concentrations (mol/liter) and take their valenzes into account, to finally determine the proper drop ratios between Miracle-Mineral-Supplement solution and, e.g., citric acid solution.