Bill, Semper Fi I retired in 89 so I'm old too. Drank a lot of water from the green Plastic canteens, metal ones too... maybe that's what turned me wild
I was always more worried about the water I filled it with from the " Water Buffalo"
Today I'm not as Young and Dumb so I'm more careful. Even when I fill my on board Water tank at home I use an additive to try and protect it. I try and drink bottled water while I'm traveling. I hate the use of plastic bottles while on grid but find them at least more comforting off grid.