Most carbon filters will improve the taste of your water, so any inexpensive Brita faucet or pitcher filter should work. And if you are mostly concerned about taste, you may think a purification system like RO is no good because it removes the tasty minerals from the water, leaving it with a flat taste. This is true, but it's easy to work around by simply adding a pinch of salt to your purified water or buying mineral drops made for this purpose.