So thinking out of the box here. How much water do you use in say 10 days? Why not get a good tank that size, fill it with good water that you treat to keep bacteria out, and use a smaller 120V pump, or gravity, or both to move water from it into the house for baths, toilets, washing dishes etc. Use bottled water from Arrowhead or someone for drinking and cooking. Then have the other 120V items you need on a smaller generator just for that purpose and the smaller pump. A 1500 gallon tank is under $1000. The Democrats in Sacramento passed a new law last year that Jerry signed setting the allowable water use per person per day not to include landscape etc at a max of 55 gallons per day - they just haven't enforced it yet but plan to as soon as they can pass legislation to have two water meters per household (inside and outside use). Use that number as your basis. It was chosen from numbers from the Santa Barbara area (Hollywood donors funded the bill - my guess is it was calculated per bedroom on a property, and with a big empty estate it skews what is actually being used per person). In your case if there are 3 people in your home then 3 x 55 = 165 gallons per day. 1500 gallons would last 9 days. If the power comes back on for a day you fill the big tank again.
