The natural state of being is freedom, it up to society to restrict what they deemed necessary and punish the offenders. Unless the body of water or reservoir are claimed by the government then it is free for anyone to use, quality notwithstanding. Safe, clean water implies certain amount of processing and I agree that unless it is explicitly written then it is up to the users to sanitize that water
> The natural state of being is freedom
That is an ideological assertion, not a fact.
The position is not that the government needs to ensure that all bodies of water are potable or that the government needs to provide clean water to every resident.
The claim is that you have a 1983 case against state officials that tell you that the municipal water is clear when they know it is in fact contaminated with lead.