Mounts below your sink and filters all cold water to your faucet.  Easily connected between the cold water cutoff valve and the faucet leveraging the existing connections.  This is a more robust and also a better performing filter than the option below. It takes up more space but is my top choice.

Mounts below your sink and filters all cold water to your faucet.  Easily connected between the cold water cutoff valve and the faucet leveraging the existing connections.  Smaller solution but still very well built and doesn't limit water flow in a noticeable manner.