I would respectfully disagree with the statement that sterile water loses it's sterility once it leaves the bottle. Are you saying that as the water leaves the bottle and travels several inches through the air to the wound, it becomes contaminated? In an ER that is exactly how a wound is cleaned out. Your example of shards of glass does pose an interesting point though. If there are very, very tiny splinters of glass, then yes, water (under some sort of pressure) may push the glass into the tissue. In this case, forceps or tweezers would be used to remove the objects. But some sort of irrigation of the would would be done first. Dirt or other debris will be flushed out of the wound with simple irrigation. It is the same premise of washing a small cut at home in the sink before applying a band aid. And yes, bottled water is more than likely just as safe as sterile water. But sterile water IS sterile.