As we mentioned elsewhere, if you have a Reverse Osmosis system in your home, you can install a plastic tee in the tubing going to the faucet and run additional tubing to your refrigerator.
However, if the layout of your home makes this impractical, many people install a simple carbon filter on the water running to their refrigerator. You can use an Omnipure 10" carbon filter for this purpose, which comes encapsulated in its own housing and connects to 1/4" tubing. It looks like this:
This will improve the taste and odor of tap water by removing chlorine, organic chemicals, and everything else which is larger than 5 microns in size. It is good for 1500 gallons of chlorinated water or 1 year, whichever comes first. (For example, if you use 5 gallons of water per day, you would need to change it in 300 days.) If your water is extremely high in total dissolved solids, it might get clogged sooner.
The price is $15.00 plus postage. (No handling fee.) Please specify whether you are replacing an existing filter or not. (If not, we will also need to send you fittings.)