MMS is not sodium hypochlorite (bleach), it is chlorine dioxide.
Its easy to make yourself, which is best because it does not keep for long unrefrigerated. Some go to great length to do this, but this is the easiest way I have found.
Fill a 500 ml resealable jar half full of distilled water.
Place 5ml of each of the two parts (28% Sodium Chlorite and 4% HCL or 100% citric acid) into a tall shot glass and swirl them together.
Place the shot glass into the water and close the jar.
Wait about two hours and discard the shot glass contents.
The Jar now contains your Chlorine Dioxide solution (which is not bleach), or MMS, in the potency commonly prescribed by drop count per water for many internal uses.
It will maintain potency in the fridge for a couple of months.