We did this for a back up for camping, but didn't want the plastic health issue. I have a family member who works with plastics so we didn't feel comfortable using as a filter for daily. But it does work and is cool for camping. We did use food grade for our back up as well, just not for daily filtering.We're fixing to buy the Berkey filters and make our own unit with 2 food grade buckets. You can find plans on the net or how-to videos on Youtube.
Well after reading one of my favorite poster's review I went ahead and bought one..I feel I made the right choice spending the money on something my family will benefit from health wise and great tasting water.. It doesn't require any electric in case no one knew that like me...I really don't think you can go wrong buying it from the supplier that I posted..with that $25.00 free gift certificate I'm going to buy the portable water bottle..Oh and the price for the Berkey light was $231.00 even and no tax which surprised me along with the free shipping..