Considering again the idea of using the 2x IBC totes (275 gallons each) as a filter system and reservoir for water.  Goals would be to constantly maintain at least 3/4 capacity of the total system, constantly being topped up with city water passing thru a filter system to remove sediment and chlorine.  The same system would be used in an emergency situation by manually filling a source barrel (see previous ideas for a gravity fed, multi-stage filter using barrels).  solar pump to move that thru the drip irrigation system & auto dog waterers.

I might start with a cheaper electric pump, and save up for a good solar pump, also saving the hours on that until no grid power to drive the other.

I need to sketch some ideas, off to find a bar napkin.

Some additional thoughts:

First tote will be chlorinated water, either from city source or from an emergency filter system.

[For emergency system source water, see http://www.swimforhim.net/6.html for chlorine production unit (yes, I plan to chlorinate the dirty water then purify it later to remove chlorine) and links from a few days ago about multi-stage sediment filters and solar distillers.]

Chlorinated water will be allowed to sit for 24 hr minimum, possibly with an air hose inserted, since chlorine is a gas and it seems some portion can be removed this way.  More research & data required though.

From this tote it will be pumped (by hand or solar pump) to to 55 gallon drum mounted on top of the 2nd tote.  This drum will contain 2-4 Berkey Black purifier elements, gravity feeding to the 2nd tote.  

http://www.green-trust.org/diyrainwater/Black_Berkey.pdf

From there, there will be a pump (hopefully one that activates on demand) so send the clean water around the house to the irrigation.