What TXI said ... run a pvc main lateral and tee off that to drip header locations. Choice of valve matters not, as long as it can handle the (low) flow. If you have more than a couple of drip zones, it is cheaper and cleaner to install a filter for the entire valve group and/or system. Since you are coming off a well, you might consider (and I would recommend) running a single filter for the entire system. Use something like Netafim Techline CV, which utilizes a pressure compensating dripper in the line. Look on their site for design specs. I highly recommend a grid when drip irrigating anything other than discrete plantings.