No need to invoke a hypothetical water example, just look to how Nestlé pushed baby formula in developing countries¹:

>For example, IBFAN claims that Nestlé distributes free formula samples to hospitals and maternity wards; after leaving the hospital, the formula is no longer free, but because the supplementation has interfered with lactation, the family must continue to buy the formula.

1: https://en.wikipedia.org/wiki/1977_Nestl%C3%A9_boycott