Out of interest, how many are using a hydration bladder in the backpack?

For my most recent trip I didn't and that was fine, but if I did I'd have to consider how I get filtered water into it. I used a Travel Tap bottle as my filter, as it removes everything incl viruses (unlike a Sawyer). I'd either have to take that (which involves taking an unnecessary bottle), or splice a filter into the tube.

Or get another filter like a trail shot and risk not being able to filter out viruses?