There is all kinds of drip tubing out there! I remember when I worked at an irrigation shop we sold all kinds of micro drip line. You can buy 1/4" line and splice in your own emitters, but if you want to save some work you also have the option of the same sized sweat line, perforated line, or if you really want to control the rate, Toro sold micro-irrigation line with integrated emitters at 1 GPH but it was $$$ by comparison.