How to make a water filter

how to make a water filter with marbles, sand, plastic bands, gravels etc ?
( No pebbles and stones allowed )
Use English please
Thanks for your attention.
Hope you can answer this as soon as possible, I do need it within these few days, thanks!!!!!!!!!!!
Update: well, really basic
Materials:
Rubber bands, Pantyhose, coffee filters,Guaze,Paper Towel,Metal Mesh,Sand (Fine, Coarse)
Gravel
Fabric
Netting Material ( Any Nets)
Marbles
No need to use all
But not allowed to use materials that are not on the list
I really need this
So PLEASE HELP!!!!!!!
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