Well, you need to bring a filter. You needed to then also, they just didn’t know what Giardia is.
Our first night, after we had made camp and eaten supper, two people came by packed up and said a bear had just ruffled through their camp and they were moving on to the next permitted camping zone. We convinced them it was too late, so they set up camp with us, and we all spent the night clutching our bear spray and starting at every rustle.
It didn’t help that a man had been killed in a predatory bear attack a few days earlier, nearby.