MRAPP,
If you have the owner's manual it should tell you how much water and antifreeze ( the calcium chloride stuff is not usually recommended, it is corrosive and is not environmentally friendly) to put in based on the size of the tires. You will need a valve stem adapter which can be purchased at some tractor dealers or at some auto parts stores. This is the basics. Check with your dealer or with a tire shop that deals with tractor and truck tires for advice. Jack the tire up slightly and connect the adapter. If you have a jug with a top that will screw on to the adapter then put the antifreeze in it and connect it to the adapter. If you don't have a jug then connect a garden hose to the adapter and pour the antifreeze in the other end of the hose. After all the antifreeze has been installed hood the hose to your water supply. Be sure to run a lot of water through the hose before your wife waters her flowers using that hose! Rotate the tire until the valve stem is at about 2oclock or 10oclock and fill with water until it is at athe level of the valve stem. This should be about a 75% fill. Your manual may recommend a differnent %, if so fill it to that %. A dealer may charge from $100 - $300 to do this. Also, check the archive for more info on this.