The lethal dose of sodium chlorite is estimated to be around 100 mg per kg of body weight. Stay far away from this amount. The "no observable adverse effect level" is around 0.01 mg per kg of body weight, when working with the concentrations used in Miracle-Mineral-Supplement .
You should be able to avoid all adverse effects by not going above the NOAEL. 0.01 mg is about 0.17 drops of Miracle-Mineral-Supplement .
So, if you weighed 60 kg, you should be totally safe and should suffer no adverse side effects from taking 10 drops of Miracle-Mineral-Supplement , unactivated in 1 liter of water.