notaplanegeek you're obviously not a traveller either are you?
Drinking tap water in many SE Asian destinations can make you seriously ill or kill you.
I'd suggest that you travel through this part of the world drinking as much tap water as possible. Possibly your headstone could read "water is water".
Personally, I think that $3.50 for airline bottled water is a bit steep, but not as steep as organ failure. But you're right this person should have had a choice.