This Instructable suggests that you drill a 5/16″ hole in the top of a Swiffer bottle, hot glue a nut over the hole and then insert a 5″16″ bolt.
You can then refill it with anything you like. Personally, I just use a regular Swiffer (with less expensive generic cloths) and spray the floor in front of me with a cheap travel spray bottle I got at Target that I filled with the better-smelling-and-more-awesome floor cleaner of my choice.
Do you hack your Swiffer? Do you knit your own Swiffer cloths at home?
Swiffer bottle hack [Instructables]