I'll have to get back to you on the details, but it is a serious issue everywhere we go, on every mission. There's a huge priority placed on potable water. You can't do anything operationally without it.
For instance, Afghanistan's climate is very dry in the summer, very hot, and people are carrying a lot of equipment. If you're not well hydrated, you're going to end up in difficulty very soon. If your water is not safe, that will manifest itself as well.
As to exactly what steps we've taken in Afghanistan, whether we're using our own reverse osmosis systems or relying on imported bottled water, I couldn't actually tell you that, sir.