@JonnyScout I strongly disagree. What toxins? Can you name them and describe the mechanism by which they are produced? How long do you think it would take for them to accumulate to levels dangerous to people?
If your vacuum pouch develops a puncture, bacteria will be the last of your worries. Adding pool shock to the water will prevent bacteria developing in the first place, so no danger there, and even if the food gets somehow (VERY doubtfully but I will grant the possibility), pool shock is otherwise sold as a water purification additive and totally safe for human consumption.
The world’s aquifers, our primary source of drinkable water, are depleting significantly. Large parts of the world are undergoing severe drought conditions. Suggesting that people throw away litres/gallons of perfectly good drinking water every time they cook something that’s been sealed in food-grade plastic is unwise, to put it mildly.
If you really can’t stomach the thought of reusing the water to cook in, at least try to find some other use for it. Water the garden, flush the toilet, wash the dog, whatever.