I use a Katadyn Pocket as well.
It's pricy but also filters 13k gallons of water on a single filter.
I picked mine up new in the box from ebay (still sealed and everything). The thing is built like a truck.
I also carry tabs and a lifestraw as backups. Although camping I've never needed anything but the pocket.
WTB: multiautomatic ghost gun with a .30-caliber clip to disperse with 30 bullets within half a second. Must include shoulder thing that goes up.
Memberships/Affiliations: CERT, ARRL ARES, NRA Patron Member, HRC, CGN/CGSSA, Cal-FFL