Glass is also quite heavy, increasing logistics costs for transport - but in an ideal world where everything runs off renewable energy sources and stupid people didn’t ruin things for the rest of us - glass would indeed be the ideal medium.

I am aware; but when the options are an entirely plastic container (clear, and readily able to oxidise and leech microplastics when exposed to light over long periods of time) versus a lined metal can (which is at least opaque) - cans are remain the lesser of two evils.

I agree with the overall sentiment; but there is no way in hell that canned water is worse than plastic bottles.

Aluminium is infinitely more/easily recyclable than plastic, and has a much lower negative impact on the environment.

But to reiterate, filling up your own bottle from the tap is preferred - but if you have to buy water in a container: can > bottle