I use a white sheet and a set of clamp lights with daylight cfl bulbs. (see What lighting equipment should I get on a very tight budget?)
It works best if you can put a little distance between the subject and background, and the key is for the background to be well lit.
Basically, you're just trying to expose for the subject and totally overexpose the background.
This shot was taken in front of an off-white wall in a somewhat dark room.
The bottle was sitting on top of a coffee can (you can just see the lid) about 3 feet away from the wall behind it. I pointed 2 lights at the wall behind, and used spot metering on the bottle. Spot metering allowed the exposure to be set for the front of the bottle, and since the background was 2-3 stops brighter, it ends up completely over-exposed.
Since you are trying to shoot down at the floor it gets a little tricky since you can not easily light the background separate from the subject.
One thing you could try is to use a white translucent plexiglass sheet as a backdrop, and light it from behind. You will need brighter lights this way, but you should be able to achieve a similar effect with a flat surface.