https://www.rei.com/product/103050/sawyer-squeeze-water-filter-system

Also available on Amazon.

I recommending ditching the pouches and attaching the filter directly to a SMART water (or similar) bottle - a proven technique used by long distance hikers. Sawyer also offers a mini version, but the regular one is more durable is reliable. There are plenty of videos on Youtube explaining how to setup and maintain the system.