Tap Water Filters & Purifers are recommended particularly in the following situations:  A small quantity of pure filtered water is all you need and you do not want a  Reverse osmosis system permanently installed , you have fairly soft water of a reasonable quality and so you will get a higher return per cartridge, or if you want to further purify water from a basic RO unit.

The main features of these units are as follows: attaches easily to your faucet in seconds; removes most sediments, chlorine, chloramine, heavy metals, organic chemicals, and inorganic ions from tap water.

Where you can go to get one

This sort of device can be found in most any home center, or online and so you should not find this process to be especially difficult, however you should still take time and consideration in your decision, as you not only want to get the best unit possible  but you also want to end up with the best quality water filter you possibly can.