OK - you just have to love the Internet! I got my own answer. a "Grain" is a unit of apothecary weight measure and weighs approximately 65 mg. A size 4 capsule (turquoise and white) will hold on average 210 mg - but it depends on the density of the substance contained within. The highest density being app. 250mg. Erring on the side of caution then, one should assume that a size 4 capsule (which is what my MMS2 came packed in) would hold app. 4 grains. Therefore, to be safe, as a first time user of MMS2, I dumped out the capsule, divided into 4 segments and dissolved one of the segments in water. You can taste it, but it is not nearly as unpleasant as MMS1. I will try this next with 2 segments, then 3, then a full capsule as my body dictates.
Cheers!