Do you have a water softener? I think that can remove most of the problem minerals. But in reading just now, they are replaced with sodium which may not be the best thing for drinking either. Still, I think it might be worth doing to save the nasty scale buildup on the faucets, toilet valves, etc. I think it would also help keep your new copper pipes from getting "clogged arteries"
We had a water softener with the salts in it and it didn't last long. Yep, I agree the salt is definitely something to consider especially with chickens/pets. Wonder if the copious minerals in water contribute to kidney stones in humans or chickens?
Keep on with those 5 gallon bottles for drinking, I think you are right, you don't have much of an option other than a pitcher filter like Brita. Our prior house was on a neighborhood well and it was hard. Not to the level of yours but scale would show on the sink faucets and I would have to periodically clean the holes in the sprayer in the kitchen sink. Current house is on a well that just serves this house. I think hardness is 7 whereas it was 11-12 at the other house and we don't get scale on the faucets. VERY lucky to not have iron or H2S like some areas of the state.
We had an under-the-sink purifying water system that had a warranty on it. Guess what? Less than 3 months and there were leaks all over the place because of the mineral blockage both in the water system and in the faucet. Had to replace the faucet. Not fun. The water heaters don't last long - about 3 years before they start sounding like microwave popcorn. Shower heads need replacing often too. CLR is a joke. Don't waste money on it. I use Muriatic pool acid once a year to get the bathtub clean for a little while, and use Lime-A-Way on toilet and bath faucets because ordinary house cleaners are a waste of money. Bleach doesn't even work to remove stains from mineral buildup.