In the coolant reservoir when the engine is cool.
You don't put water in your radiator, you put antifreeze.
2 gallons of non-toxic antifreeze
It should be a 50/50 mixture of water and antifreeze.
You should always use a 50/50 mix of antifreeze and water.
put antifreeze in it so it dont freeze
depends on what kind you buy , you can buy premixed (already has water added ) or just plane antifreeze ,then you need to mix it 50/50 with water
Antifreeze has to be put in at the overflow bottle.
50 / 50 mixture of antifreeze and preferably distilled water usually ( Ford says not to have less than 40 % antifreeze and not more than 60 % antifreeze )
You should use a gallon of coolant.