The chlorine is for the run off and summer heat to reduce bacteria. Carbon will remove it.
Sand and rocks. Try a sand filter before the system. You don't want that in your carbon filter.
I wonder what else is in your supply, Calcium Lime Tannins Iron and other goodies.
The carbon will remove Iron but you'll need a softner to remove the others.
Do you have a place to keep it from freezing? Note I'm from Fl.
Rule3 is right about having an reverse osmosis (RO).
Total Dissolved Solids (TDS) can be measured in Parts Per Million (PPM) with a meter.
The whole house system is a conditioning system usually TDS is still to high for drinking.
The RO water is stripped and as pure as distilled. Safe to drink but some don't like the taste. Others fear that their getting no minerals. Eat well and take your multi vitamins. Children might need Fluoride for healthy tooth development as it will remove it also. I wouldn't be sure if they even add fluoride.
Get as much local info as you can. I suggest not going with Culligan because your paying a salesman an installer a CEO and everyones brother. You'll get a better system for less from the independents. I prove it every day. My systems are twice the size for less money. You might not need a large system though.
Best of luck and feel free to ask anytime. Except when I'm going to bed like last night. Dang, I was tired.
One more thing, You might not need an RO if your source is safe. Maybe just an inline filter that can filter down to .5 microns. I'd need more info.