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But then people couldn't use 30 disposable water bottles a week.

How do you get the government to add the appropriate taxes? That's also easy to suggest and hard do.

I wonder if people would start drinking tap water or disposable wooden water bottles first.

Tap water really is not an option in most of the world.

Milk cartons work perfectly well for water too.

Milk cartons contain plastic.

They don't have to and not all do. There are non-plastic food-safe waterproofing liners for cardboard.