Anton, what do you mean by SMART water bottle? My current set up is an inline filter with my reservoir which works ok, but is slow. Prior to this I always used a Sawyer with the fill bags and found it tiresome. I don't think the Sawyer filter (regular size) would screw onto my Nalgene bottle.

This is my current inline filter if anyone is interested: https://www.rei.com/product/167006/rapidpure-scout-inline-hydration-pack-purifier

I've been using it for a few weeks without too much trouble but I always bring a back up lifewater bottle.