I drilled a 7/8” hole near the bottom and forced an old ¾” hose bib in. It took a lot of force to start turning that hose bib, but once it was in, no leaks, and no need for a washer or even a nut or fitting to hold it in place. The same went for the 2” PVC fitting used as a fill spout. Cutting the hole just slightly too small made for a tight fit and no fitting on the inside to hold it in place.
This bed is not as wide as the other, so I used two emitter pipes rather than four. I drilled 1/16” holes approximately 12” apart. It takes about six hours to empty the 50 gallon barrel, which means, I hope, my irrigator will water our garden plants for six long hot hours each day this summer.
I used a product called “Liquid Tape” to seal the 1/8 inch holes on my first effort, and re-drilled on the other side of the pipe with the 1/16” bit.