I've got a friend who has filtered water and a UV sterilizer on his water system, but he raises tens of thousands of rodents. I don't think it would be worth while for as small a scale as I have here.
I'm not sure if a drip system would work all that well, the water reservoir is up high and that creates more pressure. It might come out as a stream instead of a drip. I really don't know though since I've never tried it.