In reference to using bottled water to boil eggs...
Is that very expensive?
There is something she could try, in order to save money, if she isn't doing it already. After the water she cooked the eggs in cooled she could store it in the fridge to use again the next time she boiled eggs. Even if she only reused each pot of water once
, then the cost of using bottled water would fall by half
As far as the original question goes, I would not worry about a single exposure to chemical-infested water. Obviously, a lot of people in India are drinking it every day
, and they aren't keeling over in the streets or dying of cancer at an alarming rate. That is important, because if 10,000 doses hasn't killed everyone with that level of exposure, then one dose probably won't have major lasting effects on Spidergal.