Take some airline tubing and tie a knot in one end. You adjust the tightness of the knot to adjust the flow of the drip. Very simple. Best thing about it is that you can sit it and forget it - not literally of course. You don't have to keep adding water every 15 minutes.
This site has a article on acclimation as well. It is at the top between forum and search.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,