I don't mean to disagree with the entirety of your point, only that distribution is itself a problem to be solved. And even the organizations that you list are only designed to take it from willing donations to the desired causes. Each one of the customers not buying bottled water would need to separately perform the task of contacting one of these orgs and donating that money instead, every single time they would otherwise buy bottled water. That's also not counting any time or effort spent auditing potential donation targets for their ability to perform the stated goal.