I'm somewhat surprised by the responses to this question.
When traveling, the water supply is the problem and if you eat food, the water IN the food is the problem.
MMS is sodium chlorite, which IS SPECIFICALLY MADE for water purification. That's how Jim Humble came to discover Miracle-Mineral-Supplement ...by taking a weak solution of sodium chlorite (packaged as "stabalized oxygen") with him to South America and Africa.