I'm guessing he's referring to smartwater-brand bottled water. A popular lightweight setup for Appalachian Trail thru-hikers is to put a 1-liter bottled water bottle or seltzer water bottle in each of the mesh side pockets of your pack. Each time you reach a stream, you fill the bottles with dirty water, and you screw your Sawyer filter (the regular one, not the Mini) onto the threads of the water bottle. You squeeze and suck directly on the clean end of the filter to drink. After a few weeks of squeezing, the bottles start to get beat up, and you recycle them and buy a couple new liters of ice-cold bottled water when you hit the next town.
This setup is lighter weight than a hydration pack, makes perfect use of the space on the sides of most backpacks, and allows you to "dip and go" as you cross streams without stopping to actually filter water.
Photo of setup:
http://cdn.atlantatrails.com/images/sawyer-mini-re...