Ferro cement water tank

plenty of good water is about my biggest concern and im sorry but bottled water from costco just does not cut it for very long.
I have a small pond and swimming pool but realy needed something for storage of drinking water/rainwater.
This is a ferrocement tank not yet completed. Today I have to finish
plastering the inside and out.the roof Ill get to next week
It is about 2500 gallons and looks to be costing out at about 400 dollars
but lots of work.

framework was made from concrete matting and stucco net/chicken wire
roof section will be made from welded reo rod.concrete was used for base
with mortar type s being used for the sides and plastering.