I didn't read the article, but what if you only have 1 water bottle?
Lets assume one 1 litre metal water bottle and a 1-2 litre platypus plastic bottle and 1 MSR reactor stove.
I think 1 bottle != 1 bottle + 1-2 liter bottle.
:-P
And besides, once you are not thinking clearly, you likely aren't going to figure the optimal way to do something.
*shrug*
-john