CAPcap is interesting. Works great, but the smaller cap likes to get stuck and is hard to work wearing gloves. Great idea, but I give it a solid "blah". I have one on my EDC bottle- 3 times out of four, it is the big cap that unscrews.

As was mentioned, let the tabs dissolve, loosen slightly, invert the bottle, shake a few times, seal it back up.

I recommend having specific bottles for the purification stage, preferably clear ones. I then transfer them to my steel bottles (which I try to put only potable in UNLESS I'm going to be boiling it, which will heat the bottle enough to kill anything nasty on it) and/or or a bladder (which never, EVER has anything but potable in it).

And what water filters have a limited life? Let them dry before you store them and you're fine. In the field, let them dry out overnight.

Edit: By limited life, do you mean limited stored life, or limited usage life? I read it inintially to mean stored life like chemical treatments do. But yes, they do have a limited life cycle on the filter, but depending on the model that can be thousands of liters.