Thanks!

While the health/safety issue with not protecting the watersupply is very problamatic, I do not agree with the assumption that the tanks should have to be drownproofed somehow.

It's a tricky issue and I can see your point of view too. I think you can't deathproof the whole world and you can't prevent accidents 100%.

Also this is a very freak sort of incident.

What worries me more is the fact that people could (if they had bad intentions) interfere with (e.g. poison) the water which I don't think is excusable.