R&S Water Service has some of the best tasting water in the county, for only a quarter a gallon! You have to take your own clean water bottles and refill them yourself, but it is worth the money saved over having it home delivered. You can also avoid having extra empty bottles lying around waiting for the water delivery, or worrying about where to store the full bottles once they are delivered.
Naturally, R&S does much more than provide filtered water - far more than would be proper for such a review.
PROS: Cheap, clean, drinking water
CONS: You have to carry heavy bottles yourself