Off the Grid
Clapp's Home-Made Water Filter. this filter is composed of the simplest materials - sand and charcoal. The filter is arranged from a 50-gallon wine cask with a false bottom, perforated; on this a layer of gravel, then alternate layers of charcoal and white, clean sand, and top layer of excelsior, with perforated cover ten inches from the top, and a discharge-pipe or over-flow four inches from the top.
How To Live Off the Grid - Living off the grid basically means living without the supply of gas, electricity and even water provided by local authorities. In the survival community, most are more concern with short-term ways to live off the grid in cases (EMP, natural disasters, etc) where essential supplies like electricity and water would be unavailable for a short period of time.