A coffee filter works nice. Also, you can cut the curved upper part of a ~2 liter PET bottle to use as a funnel. I've used this for filtering since I was in high-school and I didn't have access to "proper" chemical equipment for my experiments.
Hope that helps.
Also, does anyone have experience with those home filters (with reverse osmosis, carbon, silver,etc stages)? My aunt has one and uses it for drinking water. The conductivity is really low, but I was wondering if anyone tried using that water for darkroom work.