Some I know are carrying short lengths of thin tubing for sipping water out of seeps and such.
When backpacking, I've always carried 4-8 feet of flexible tubing, usually just aquarium tubing, so I can set up a siphon from any tiny trickle. The longer the tubing, the further downhill you can put the water container on a shallow slope, and the faster the siphon works. This lets me collect as much water as I need from tiny trickles without much work- just go do something else while the canteen fills- and it probably uses less bulk and weight than a syringe big enough to use for the same thing.