What's your water filter-hydration setup?

Only had two filters both are Katydyn hiker pros. I looked at the sweetwater but went with the Katydyn mainly because I had just purchased a new filter for my original katydyn which suffered from a cracked housing when I droped it on some rocks on a cold day. Before the filters I used the potable aqua tabs which were nice cause they were light and small but I didn't like waiting for a half an hour before drinking. I was hiking with someone who was using the ultraviolet pen which seemed nice and small but like being able to get water from small springs and other areas where it would be hard to fill up a bottle to use the pen on The filters make this nice and I can get water from about any source regardless of how deep it is. Plus alot of the water around where I hike has a tinge to it from the tannic acid and I've read where the pens work best in clear water.
As far as what a carry water in I have a couple nalgenes and a large platypus bladder for filling up at the last stop before camp (if camp is dry)

Over the past 10 years I've only had 3 filters. The first was a Katadyn Hiker. I replaced it with the Hiker Pro. It attaches to bladders via a coupling so you can pump right into the bladder w/o risk of spillage. You do have to "burp" the bladder if you are filling it to max capacity.I broke the handle on the first Pro by trying to push water through a clogged filter. The cartridges are kind of expensive but I usually get a season out of one unless I'm pumping out of a muddy source. That's the only maintenance except for adding some silicon lubricant to the pump shaft. I use a 3 liter Nalgene bladder. Only leakage I ever encountered was from a puncture when I had improperly packed the pack and then leaned against it when taking a break. I don't know about other bladders but the Nalgene bite valve has a locked position - sort of an on off valve - that prevents accidental leakage from the tube.

I remember some folks claiming that the disposal Katadyn filter cartridges can be rejuvenated by soaking in hot/boiling water. While this will allow you to pump water it will no longer trap all the microscopic nasties it was originally designed to extract. Don't be cheap and get yourself sick. Buy a new cartridge.

I use a PUR (Katadyn) Hiker for filtering water. If the water is from a nice mountain source, I will use my Steripen. 3+ years with no failure, besides battery replacement. I also always carry tablets for the 'last ditch'.

As for storage, I use a Nalgene 32oz. that I keep my duct tape, waterproof med tape, and Leukotape on, along with a 100oz. Platypus BigZip. I bought it after my pal's lasted two years, and mine is going into it's third season, unscathed.