I've lived off-grid for three long summers (late spring to early fall). It's tremendous work. Most of the same systems exist it's just that one has to research, design, build, operate, maintain, and revise them instead of somebody else doing all that. Everybody has different goals, but for me, maintaining my own potable water system is not a goal or something I'm interested in. Living off-grid did change my perspective on some things. For example, I know now that I produce about a 4-gallon bucket of poop each month and yet my house has a tremendous sewer connection.