Yea, then do the RO and use a few carbon containing prefilters, get
big ones if you can.
Those will help really extend the life of the TFC membrane.
Change the carbon and prefilter every 3 months.
Damn chickens.

To reconsitute: buy some pool hardness increaser. CaCl2, it's cheap
and easy to dissolve in water. Add MgSO4, epsom salt, for the Mg and
Ca combo. add about 4:1 Ca:Mg to adjust the GH up to 3+.
That's the cheapest route.
Add baking soda for KH to about 3 degrees KH.

There, you are done. Ask for free chickens/Turkeys as payment for the
water bill:-)

Regards,
Tom Barr