Problem with drinking urine (besides the emotional aversion, smell and taste) is that it is a waste product. Besides water, it is loaded with uric acid and salt- WHICH YOUR BODY IS TRYING TO GET RID OF.
A filter removes solid things. It does not remove dissolved things. The only "filter" that I know of that will do that is a reverse osmosis unit- and THEY are water hogs. You could distill it- and when in country where water could be a problem, I keep a length of plastic tubing and a sheet of poly in my pack- solar still is easy to make.
Under EXTREME circumstances, you may be able to STRETCH available potable water by cutting it with urine, but it is a similar effect to breathing in and out of a plastic bag. Running that air through a filter will not replace oxygen that was consumed from the air.
What we have here is... failure- to communicate.