1/2 — 3/4 of the way full with apple cider vinegar. (No other vinegar will work, btw. It has to be apple cider vinegar.) Add a few drops of dish soap, then fill the rest of the jar with water until the bubbles reach the rim of the jar.
Make your own "Better than Swiffer" Dusters. Microfiber seems to work best, it really grabs the dust. You can usually finds sheets of it in the car cleaning section. You can also easily make swiffer mop covers too, by just measuring a rectangle about twice as long as the mop, folding over the ends to fit it and sewing them in place.