I show how I use a fabric bucket for the reservoir on a gravity water filter system.
Parts List:
1 ea. bucket: http://www.amazon.com/Seattle-Sports-Free-Pocket-Bucket/dp/B00AXYD168/ref=sr_1_22?s=sporting-goods&ie=UTF8&qid=1434309049&sr=1-22
2 ea: hose stem: http://www.usplastic.com/catalog/item.aspx?itemid=75179
1ea bulkhead fitting: http://www.usplastic.com/catalog/item.aspx?itemid=75157
7 feet Silicone tube: http://www.usplastic.com/catalog/item.aspx?itemid=36286
2 eah tubing clamps: http://www.usplastic.com/catalog/item.aspx?itemid=31257
Golf ball size wiffle ball: local sports store (that's the best I can do on that)
Prefilter material of your choice.
Water filter of your choice either a Sawyer squeeze or Sawyer Mini will work, but the Squeeze will required adaptors.