Last back country trip I took that involved a lot questionable water sources (Mongolia), I used purification tablets. Dirt cheap, easy to use, takes no space at all, stores safely (from water/physical damage), kills everything, easy to know if it's working (smell and taste), and purifies as much water as you want in whatever container is available. Plus you don't look like a clown and offend your local hosts by pulling out a silly over-engineered straw to drink their water.
Straws are supposed to be last resort survival devices--and ideally are single use since micro-tears in the filter won't be observable to you (i.e. they fail in a way that leaves you screwed and provides no warning). Honestly, you don't have room in your survival pack for junk and gimmicks.