Well, that's a little more than a liter so I'd guess three total punches on the button, 2 the first round and 1 the second round. Make sure you wipe the rim off really well because any fluid on the outside won't get treated. That's one of the reasons most people use the nalgene, because you can get one of those Human Gear lids that have a second lid that's not touching the main lid threads. Plus it's got to be a lot lighter than that stainless steel Guyot.
i saw that humangear the other day on here,the classic3 comes with a prefilter that screws on which is kinda nice. i was figuring on the 3 click method too.
i emailed katydan and will post when i get an answer