Depending what you're doing with your rainwater, seems like landscape fabric would be ok, its made for gardening after all. I personally wouldn't drink through it. Food grade plastic recycling is number 5, maybe you could find that on the package. I believe its nylon, aka plastic. Asphalt shingles leach carcinogens from the bitament . How will you clean your sand filter when its time? I used a few bio filters for pond pumps, many used a thick nylon filter in them. You can buy a generic cut to size washable a/c filter at the depot. Its blue plastic, 1"x 30x 36 or some thing like that.
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