Yeah, you see those FDA rangers on the trail all the time! <img src="/forums/images/graemlins/grin.gif" alt="" />

Sorry, Jim; couldn't resist. But I will echo your warning about doing something to the bottle to identify it. The ID isn't necessary on the trail, so much, but since your gear spends a lot of time laying around the house, it does serve a safety purpose there. It might keep someone from accidentally using it, or from seeing an empty container that would be just right for syrup, ketchup, etc. - unaware that it's contaminated with gas residue.