The following is from Jim Humble's 2011 book (edited).
To Make a Citric Acid 50% Solution
Pack a cup or small bowl with citric acid powder (crystals), tamping it down to fill air holes. Dump it in a larger bowl. Then fill the same cup or small bowl with distilled or purified water and dump that in the larger bowl. The citric acid powder weighs almost the same as water and is close enough for the purpose. 75g each will fill a 4fl.oz. bottle.
Stir till dissolved. You will notice that the mixture becomes cold. Then pour it into a bottle(s) with a drip style top for counting drops and label it 50% citric acid. Use it for activating MMS at one drop for each drop of MMS.
Whichever strength of citric acid you make, always store it in a bottle with a lid. When using citric acid as an activator, be sure to keep in mind all of the other instructions concerning how to mix and take MMS. To fill a 4 fl.oz. bottle mix 75gm each H2o & citric acid crystals.
75 grams of water is equal to 75 ml of water or about 2.5 fl oz. So, you would need about 2.5 fl oz of water and 2.5 fl oz of citric acid crystals to fill a 4 fl oz bottle.
Regarding alkalizing your body, you might be interested in reading
this
article.